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Finding the Fourth Proportional to 72,468.60, 108,691.26 and 19,865.88

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Solution

The fourth proportional to 72,468.60, 108,691.26 and 19,865.88 is: 29,795.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,468.60 : 108,691.26 = 19,865.88 : x
  2. Step 2: Convert to fraction form
    72,468.60/108,691.26 = 19,865.88/x
  3. Step 3: Cross multiply
    72,468.60x = 108,691.26 × 19,865.88
  4. Step 4: Simplify right side
    72,468.60x = 2,159,247,528.21
  5. Step 5: Solve for x
    x = 2,159,247,528.21/72,468.60
  6. Step 6: Final answer
    x = 29,795.63

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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.