Home / 81,147.52-121,721.33-31,251.12

Finding the Fourth Proportional to 81,147.52, 121,721.33 and 31,251.12

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Solution

The fourth proportional to 81,147.52, 121,721.33 and 31,251.12 is: 46,876.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,147.52 : 121,721.33 = 31,251.12 : x
  2. Step 2: Convert to fraction form
    81,147.52/121,721.33 = 31,251.12/x
  3. Step 3: Cross multiply
    81,147.52x = 121,721.33 × 31,251.12
  4. Step 4: Simplify right side
    81,147.52x = 3,803,927,512.06
  5. Step 5: Solve for x
    x = 3,803,927,512.06/81,147.52
  6. Step 6: Final answer
    x = 46,876.69

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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.