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Finding the Fourth Proportional to 287,789,428.10, 431,684,142.15 and 200,113,472.90

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Solution

The fourth proportional to 287,789,428.10, 431,684,142.15 and 200,113,472.90 is: 300,170,209.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,789,428.10 : 431,684,142.15 = 200,113,472.90 : x
  2. Step 2: Convert to fraction form
    287,789,428.10/431,684,142.15 = 200,113,472.90/x
  3. Step 3: Cross multiply
    287,789,428.10x = 431,684,142.15 × 200,113,472.90
  4. Step 4: Simplify right side
    287,789,428.10x = 86,385,812,881,493,776
  5. Step 5: Solve for x
    x = 86,385,812,881,493,776/287,789,428.10
  6. Step 6: Final answer
    x = 300,170,209.35

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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.