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Finding the Fourth Proportional to 257,419.12, 386,124.55 and 79,926.31

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Solution

The fourth proportional to 257,419.12, 386,124.55 and 79,926.31 is: 119,888.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,419.12 : 386,124.55 = 79,926.31 : x
  2. Step 2: Convert to fraction form
    257,419.12/386,124.55 = 79,926.31/x
  3. Step 3: Cross multiply
    257,419.12x = 386,124.55 × 79,926.31
  4. Step 4: Simplify right side
    257,419.12x = 30,861,510,481.91
  5. Step 5: Solve for x
    x = 30,861,510,481.91/257,419.12
  6. Step 6: Final answer
    x = 119,888.18

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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.