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Finding the Fourth Proportional to 171,691.92, 257,422.32 and 66,387.60

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Solution

The fourth proportional to 171,691.92, 257,422.32 and 66,387.60 is: 99,536.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,691.92 : 257,422.32 = 66,387.60 : x
  2. Step 2: Convert to fraction form
    171,691.92/257,422.32 = 66,387.60/x
  3. Step 3: Cross multiply
    171,691.92x = 257,422.32 × 66,387.60
  4. Step 4: Simplify right side
    171,691.92x = 17,089,650,011.23
  5. Step 5: Solve for x
    x = 17,089,650,011.23/171,691.92
  6. Step 6: Final answer
    x = 99,536.72

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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.