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Finding the Fourth Proportional to 139,955.68, 193,129.15 and 78,711.04

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Solution

The fourth proportional to 139,955.68, 193,129.15 and 78,711.04 is: 108,615.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,955.68 : 193,129.15 = 78,711.04 : x
  2. Step 2: Convert to fraction form
    139,955.68/193,129.15 = 78,711.04/x
  3. Step 3: Cross multiply
    139,955.68x = 193,129.15 × 78,711.04
  4. Step 4: Simplify right side
    139,955.68x = 15,201,396,250.82
  5. Step 5: Solve for x
    x = 15,201,396,250.82/139,955.68
  6. Step 6: Final answer
    x = 108,615.79

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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.