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Finding the Fourth Proportional to 256,461.20, 384,691.80 and 66,921.20

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Solution

The fourth proportional to 256,461.20, 384,691.80 and 66,921.20 is: 100,381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,461.20 : 384,691.80 = 66,921.20 : x
  2. Step 2: Convert to fraction form
    256,461.20/384,691.80 = 66,921.20/x
  3. Step 3: Cross multiply
    256,461.20x = 384,691.80 × 66,921.20
  4. Step 4: Simplify right side
    256,461.20x = 25,744,036,886.16
  5. Step 5: Solve for x
    x = 25,744,036,886.16/256,461.20
  6. Step 6: Final answer
    x = 100,381.80

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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.