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Finding the Fourth Proportional to 139,312.19, 192,250.31 and 78,876.87

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Solution

The fourth proportional to 139,312.19, 192,250.31 and 78,876.87 is: 108,849.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,312.19 : 192,250.31 = 78,876.87 : x
  2. Step 2: Convert to fraction form
    139,312.19/192,250.31 = 78,876.87/x
  3. Step 3: Cross multiply
    139,312.19x = 192,250.31 × 78,876.87
  4. Step 4: Simplify right side
    139,312.19x = 15,164,102,314.95
  5. Step 5: Solve for x
    x = 15,164,102,314.95/139,312.19
  6. Step 6: Final answer
    x = 108,849.79

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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.