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Finding the Fourth Proportional to 256,387.86, 384,618.24 and 78,909.66

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Solution

The fourth proportional to 256,387.86, 384,618.24 and 78,909.66 is: 118,375.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,387.86 : 384,618.24 = 78,909.66 : x
  2. Step 2: Convert to fraction form
    256,387.86/384,618.24 = 78,909.66/x
  3. Step 3: Cross multiply
    256,387.86x = 384,618.24 × 78,909.66
  4. Step 4: Simplify right side
    256,387.86x = 30,350,094,548.20
  5. Step 5: Solve for x
    x = 30,350,094,548.20/256,387.86
  6. Step 6: Final answer
    x = 118,375.71

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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.