Home / 81,128.91-121,645.95-54,505.83

Finding the Fourth Proportional to 81,128.91, 121,645.95 and 54,505.83

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Solution

The fourth proportional to 81,128.91, 121,645.95 and 54,505.83 is: 81,726.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,128.91 : 121,645.95 = 54,505.83 : x
  2. Step 2: Convert to fraction form
    81,128.91/121,645.95 = 54,505.83/x
  3. Step 3: Cross multiply
    81,128.91x = 121,645.95 × 54,505.83
  4. Step 4: Simplify right side
    81,128.91x = 6,630,413,470.89
  5. Step 5: Solve for x
    x = 6,630,413,470.89/81,128.91
  6. Step 6: Final answer
    x = 81,726.89

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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.