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Finding the Fourth Proportional to 141,787.20, 212,680.80 and 89,428.80

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Solution

The fourth proportional to 141,787.20, 212,680.80 and 89,428.80 is: 134,143.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,787.20 : 212,680.80 = 89,428.80 : x
  2. Step 2: Convert to fraction form
    141,787.20/212,680.80 = 89,428.80/x
  3. Step 3: Cross multiply
    141,787.20x = 212,680.80 × 89,428.80
  4. Step 4: Simplify right side
    141,787.20x = 19,019,788,727.04
  5. Step 5: Solve for x
    x = 19,019,788,727.04/141,787.20
  6. Step 6: Final answer
    x = 134,143.20

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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.