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Finding the Fourth Proportional to 638,136.70, 957,205.05 and 389,304.70

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Solution

The fourth proportional to 638,136.70, 957,205.05 and 389,304.70 is: 583,957.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,136.70 : 957,205.05 = 389,304.70 : x
  2. Step 2: Convert to fraction form
    638,136.70/957,205.05 = 389,304.70/x
  3. Step 3: Cross multiply
    638,136.70x = 957,205.05 × 389,304.70
  4. Step 4: Simplify right side
    638,136.70x = 372,644,424,828.74
  5. Step 5: Solve for x
    x = 372,644,424,828.74/638,136.70
  6. Step 6: Final answer
    x = 583,957.05

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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.