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Finding the Fourth Proportional to 73,731.20, 110,596.80 and 21,139.52

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Solution

The fourth proportional to 73,731.20, 110,596.80 and 21,139.52 is: 31,709.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,731.20 : 110,596.80 = 21,139.52 : x
  2. Step 2: Convert to fraction form
    73,731.20/110,596.80 = 21,139.52/x
  3. Step 3: Cross multiply
    73,731.20x = 110,596.80 × 21,139.52
  4. Step 4: Simplify right side
    73,731.20x = 2,337,963,265.54
  5. Step 5: Solve for x
    x = 2,337,963,265.54/73,731.20
  6. Step 6: Final answer
    x = 31,709.28

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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.