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Finding the Fourth Proportional to 72,419.28, 108,732.60 and 53,756.88

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Solution

The fourth proportional to 72,419.28, 108,732.60 and 53,756.88 is: 80,712.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,419.28 : 108,732.60 = 53,756.88 : x
  2. Step 2: Convert to fraction form
    72,419.28/108,732.60 = 53,756.88/x
  3. Step 3: Cross multiply
    72,419.28x = 108,732.60 × 53,756.88
  4. Step 4: Simplify right side
    72,419.28x = 5,845,125,330.29
  5. Step 5: Solve for x
    x = 5,845,125,330.29/72,419.28
  6. Step 6: Final answer
    x = 80,712.28

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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.