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Finding the Fourth Proportional to 72,437.70, 108,620.10 and 42,864.60

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Solution

The fourth proportional to 72,437.70, 108,620.10 and 42,864.60 is: 64,275.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,437.70 : 108,620.10 = 42,864.60 : x
  2. Step 2: Convert to fraction form
    72,437.70/108,620.10 = 42,864.60/x
  3. Step 3: Cross multiply
    72,437.70x = 108,620.10 × 42,864.60
  4. Step 4: Simplify right side
    72,437.70x = 4,655,957,138.46
  5. Step 5: Solve for x
    x = 4,655,957,138.46/72,437.70
  6. Step 6: Final answer
    x = 64,275.33

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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.