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Finding the Fourth Proportional to 91,465.59, 126,138.66 and 78,540.48

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Solution

The fourth proportional to 91,465.59, 126,138.66 and 78,540.48 is: 108,313.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,465.59 : 126,138.66 = 78,540.48 : x
  2. Step 2: Convert to fraction form
    91,465.59/126,138.66 = 78,540.48/x
  3. Step 3: Cross multiply
    91,465.59x = 126,138.66 × 78,540.48
  4. Step 4: Simplify right side
    91,465.59x = 9,906,990,135.41
  5. Step 5: Solve for x
    x = 9,906,990,135.41/91,465.59
  6. Step 6: Final answer
    x = 108,313.85

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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.