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Finding the Fourth Proportional to 256,672.87, 384,979.89 and 67,151.53

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Solution

The fourth proportional to 256,672.87, 384,979.89 and 67,151.53 is: 100,719.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,672.87 : 384,979.89 = 67,151.53 : x
  2. Step 2: Convert to fraction form
    256,672.87/384,979.89 = 67,151.53/x
  3. Step 3: Cross multiply
    256,672.87x = 384,979.89 × 67,151.53
  4. Step 4: Simplify right side
    256,672.87x = 25,851,988,632.73
  5. Step 5: Solve for x
    x = 25,851,988,632.73/256,672.87
  6. Step 6: Final answer
    x = 100,719.60

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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.