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Finding the Fourth Proportional to 139,706.49, 192,789.21 and 79,275.87

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Solution

The fourth proportional to 139,706.49, 192,789.21 and 79,275.87 is: 109,397.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,706.49 : 192,789.21 = 79,275.87 : x
  2. Step 2: Convert to fraction form
    139,706.49/192,789.21 = 79,275.87/x
  3. Step 3: Cross multiply
    139,706.49x = 192,789.21 × 79,275.87
  4. Step 4: Simplify right side
    139,706.49x = 15,283,532,349.36
  5. Step 5: Solve for x
    x = 15,283,532,349.36/139,706.49
  6. Step 6: Final answer
    x = 109,397.44

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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.