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Finding the Fourth Proportional to 138,913.86, 191,689.74 and 78,489.75

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Solution

The fourth proportional to 138,913.86, 191,689.74 and 78,489.75 is: 108,309.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913.86 : 191,689.74 = 78,489.75 : x
  2. Step 2: Convert to fraction form
    138,913.86/191,689.74 = 78,489.75/x
  3. Step 3: Cross multiply
    138,913.86x = 191,689.74 × 78,489.75
  4. Step 4: Simplify right side
    138,913.86x = 15,045,679,770.17
  5. Step 5: Solve for x
    x = 15,045,679,770.17/138,913.86
  6. Step 6: Final answer
    x = 108,309.42

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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.