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Finding the Fourth Proportional to 91,406.80, 136,915.80 and 75,854.80

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Solution

The fourth proportional to 91,406.80, 136,915.80 and 75,854.80 is: 113,620.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,406.80 : 136,915.80 = 75,854.80 : x
  2. Step 2: Convert to fraction form
    91,406.80/136,915.80 = 75,854.80/x
  3. Step 3: Cross multiply
    91,406.80x = 136,915.80 × 75,854.80
  4. Step 4: Simplify right side
    91,406.80x = 10,385,720,625.84
  5. Step 5: Solve for x
    x = 10,385,720,625.84/91,406.80
  6. Step 6: Final answer
    x = 113,620.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.