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Finding the Fourth Proportional to 139,397.70, 192,356.88 and 77,310.19

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Solution

The fourth proportional to 139,397.70, 192,356.88 and 77,310.19 is: 106,681.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,397.70 : 192,356.88 = 77,310.19 : x
  2. Step 2: Convert to fraction form
    139,397.70/192,356.88 = 77,310.19/x
  3. Step 3: Cross multiply
    139,397.70x = 192,356.88 × 77,310.19
  4. Step 4: Simplify right side
    139,397.70x = 14,871,146,940.61
  5. Step 5: Solve for x
    x = 14,871,146,940.61/139,397.70
  6. Step 6: Final answer
    x = 106,681.44

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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.