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Finding the Fourth Proportional to 80,965.20, 121,447.80 and 25,561.20

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Solution

The fourth proportional to 80,965.20, 121,447.80 and 25,561.20 is: 38,341.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,965.20 : 121,447.80 = 25,561.20 : x
  2. Step 2: Convert to fraction form
    80,965.20/121,447.80 = 25,561.20/x
  3. Step 3: Cross multiply
    80,965.20x = 121,447.80 × 25,561.20
  4. Step 4: Simplify right side
    80,965.20x = 3,104,351,505.36
  5. Step 5: Solve for x
    x = 3,104,351,505.36/80,965.20
  6. Step 6: Final answer
    x = 38,341.80

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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.