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Finding the Fourth Proportional to 638,188.70, 957,283.05 and 520,090.70

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Solution

The fourth proportional to 638,188.70, 957,283.05 and 520,090.70 is: 780,136.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,188.70 : 957,283.05 = 520,090.70 : x
  2. Step 2: Convert to fraction form
    638,188.70/957,283.05 = 520,090.70/x
  3. Step 3: Cross multiply
    638,188.70x = 957,283.05 × 520,090.70
  4. Step 4: Simplify right side
    638,188.70x = 497,874,011,572.64
  5. Step 5: Solve for x
    x = 497,874,011,572.64/638,188.70
  6. Step 6: Final answer
    x = 780,136.05

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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.