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Finding the Fourth Proportional to 459,787.20, 689,680.80 and 127,363.20

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Solution

The fourth proportional to 459,787.20, 689,680.80 and 127,363.20 is: 191,044.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,787.20 : 689,680.80 = 127,363.20 : x
  2. Step 2: Convert to fraction form
    459,787.20/689,680.80 = 127,363.20/x
  3. Step 3: Cross multiply
    459,787.20x = 689,680.80 × 127,363.20
  4. Step 4: Simplify right side
    459,787.20x = 87,839,953,666.56
  5. Step 5: Solve for x
    x = 87,839,953,666.56/459,787.20
  6. Step 6: Final answer
    x = 191,044.80

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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.