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Finding the Fourth Proportional to 91,578.80, 126,375 and 51,291.92

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Solution

The fourth proportional to 91,578.80, 126,375 and 51,291.92 is: 70,780.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,578.80 : 126,375 = 51,291.92 : x
  2. Step 2: Convert to fraction form
    91,578.80/126,375 = 51,291.92/x
  3. Step 3: Cross multiply
    91,578.80x = 126,375 × 51,291.92
  4. Step 4: Simplify right side
    91,578.80x = 6,482,016,390
  5. Step 5: Solve for x
    x = 6,482,016,390/91,578.80
  6. Step 6: Final answer
    x = 70,780.75

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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.