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Finding the Fourth Proportional to 424,136.71, 636,070 and 139,774.20

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Solution

The fourth proportional to 424,136.71, 636,070 and 139,774.20 is: 209,616.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    424,136.71 : 636,070 = 139,774.20 : x
  2. Step 2: Convert to fraction form
    424,136.71/636,070 = 139,774.20/x
  3. Step 3: Cross multiply
    424,136.71x = 636,070 × 139,774.20
  4. Step 4: Simplify right side
    424,136.71x = 88,906,175,394
  5. Step 5: Solve for x
    x = 88,906,175,394/424,136.71
  6. Step 6: Final answer
    x = 209,616.79

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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.