Home / 81,081.29-121,677.30-28,490.78

Finding the Fourth Proportional to 81,081.29, 121,677.30 and 28,490.78

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Solution

The fourth proportional to 81,081.29, 121,677.30 and 28,490.78 is: 42,755.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,081.29 : 121,677.30 = 28,490.78 : x
  2. Step 2: Convert to fraction form
    81,081.29/121,677.30 = 28,490.78/x
  3. Step 3: Cross multiply
    81,081.29x = 121,677.30 × 28,490.78
  4. Step 4: Simplify right side
    81,081.29x = 3,466,681,185.29
  5. Step 5: Solve for x
    x = 3,466,681,185.29/81,081.29
  6. Step 6: Final answer
    x = 42,755.62

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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.