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Finding the Fourth Proportional to 317,787.18, 476,680.35 and 81,129.90

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Solution

The fourth proportional to 317,787.18, 476,680.35 and 81,129.90 is: 121,694.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,787.18 : 476,680.35 = 81,129.90 : x
  2. Step 2: Convert to fraction form
    317,787.18/476,680.35 = 81,129.90/x
  3. Step 3: Cross multiply
    317,787.18x = 476,680.35 × 81,129.90
  4. Step 4: Simplify right side
    317,787.18x = 38,673,029,127.47
  5. Step 5: Solve for x
    x = 38,673,029,127.47/317,787.18
  6. Step 6: Final answer
    x = 121,694.74

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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.