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Finding the Fourth Proportional to 138,930.50, 191,724.17 and 75,268.74

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Solution

The fourth proportional to 138,930.50, 191,724.17 and 75,268.74 is: 103,870.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,930.50 : 191,724.17 = 75,268.74 : x
  2. Step 2: Convert to fraction form
    138,930.50/191,724.17 = 75,268.74/x
  3. Step 3: Cross multiply
    138,930.50x = 191,724.17 × 75,268.74
  4. Step 4: Simplify right side
    138,930.50x = 14,430,836,703.45
  5. Step 5: Solve for x
    x = 14,430,836,703.45/138,930.50
  6. Step 6: Final answer
    x = 103,870.90

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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.