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Finding the Fourth Proportional to 91,574.92, 126,249.32 and 78,288.89

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Solution

The fourth proportional to 91,574.92, 126,249.32 and 78,288.89 is: 107,932.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,574.92 : 126,249.32 = 78,288.89 : x
  2. Step 2: Convert to fraction form
    91,574.92/126,249.32 = 78,288.89/x
  3. Step 3: Cross multiply
    91,574.92x = 126,249.32 × 78,288.89
  4. Step 4: Simplify right side
    91,574.92x = 9,883,918,734.61
  5. Step 5: Solve for x
    x = 9,883,918,734.61/91,574.92
  6. Step 6: Final answer
    x = 107,932.60

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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.