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Finding the Fourth Proportional to 75,679.80, 113,438.70 and 25,713.60

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Solution

The fourth proportional to 75,679.80, 113,438.70 and 25,713.60 is: 38,542.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,679.80 : 113,438.70 = 25,713.60 : x
  2. Step 2: Convert to fraction form
    75,679.80/113,438.70 = 25,713.60/x
  3. Step 3: Cross multiply
    75,679.80x = 113,438.70 × 25,713.60
  4. Step 4: Simplify right side
    75,679.80x = 2,916,917,356.32
  5. Step 5: Solve for x
    x = 2,916,917,356.32/75,679.80
  6. Step 6: Final answer
    x = 38,542.88

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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.