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Finding the Fourth Proportional to 638,153.40, 957,230.10 and 217,903.80

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Solution

The fourth proportional to 638,153.40, 957,230.10 and 217,903.80 is: 326,855.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,153.40 : 957,230.10 = 217,903.80 : x
  2. Step 2: Convert to fraction form
    638,153.40/957,230.10 = 217,903.80/x
  3. Step 3: Cross multiply
    638,153.40x = 957,230.10 × 217,903.80
  4. Step 4: Simplify right side
    638,153.40x = 208,584,076,264.38
  5. Step 5: Solve for x
    x = 208,584,076,264.38/638,153.40
  6. Step 6: Final answer
    x = 326,855.70

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.