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Finding the Fourth Proportional to 139,761.24, 192,871.70 and 79,332

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Solution

The fourth proportional to 139,761.24, 192,871.70 and 79,332 is: 109,478.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,761.24 : 192,871.70 = 79,332 : x
  2. Step 2: Convert to fraction form
    139,761.24/192,871.70 = 79,332/x
  3. Step 3: Cross multiply
    139,761.24x = 192,871.70 × 79,332
  4. Step 4: Simplify right side
    139,761.24x = 15,300,897,704.40
  5. Step 5: Solve for x
    x = 15,300,897,704.40/139,761.24
  6. Step 6: Final answer
    x = 109,478.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.