Home / 81,111.24-121,721.10-28,520.52

Finding the Fourth Proportional to 81,111.24, 121,721.10 and 28,520.52

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Solution

The fourth proportional to 81,111.24, 121,721.10 and 28,520.52 is: 42,799.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,111.24 : 121,721.10 = 28,520.52 : x
  2. Step 2: Convert to fraction form
    81,111.24/121,721.10 = 28,520.52/x
  3. Step 3: Cross multiply
    81,111.24x = 121,721.10 × 28,520.52
  4. Step 4: Simplify right side
    81,111.24x = 3,471,549,066.97
  5. Step 5: Solve for x
    x = 3,471,549,066.97/81,111.24
  6. Step 6: Final answer
    x = 42,799.85

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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.