Home / 87,819.30-121,160.89-57,178.40

Finding the Fourth Proportional to 87,819.30, 121,160.89 and 57,178.40

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Solution

The fourth proportional to 87,819.30, 121,160.89 and 57,178.40 is: 78,886.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,819.30 : 121,160.89 = 57,178.40 : x
  2. Step 2: Convert to fraction form
    87,819.30/121,160.89 = 57,178.40/x
  3. Step 3: Cross multiply
    87,819.30x = 121,160.89 × 57,178.40
  4. Step 4: Simplify right side
    87,819.30x = 6,927,785,992.73
  5. Step 5: Solve for x
    x = 6,927,785,992.73/87,819.30
  6. Step 6: Final answer
    x = 78,886.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.