Home / 87,921.90-131,796.45-78,590.70

Finding the Fourth Proportional to 87,921.90, 131,796.45 and 78,590.70

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Solution

The fourth proportional to 87,921.90, 131,796.45 and 78,590.70 is: 117,808.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,921.90 : 131,796.45 = 78,590.70 : x
  2. Step 2: Convert to fraction form
    87,921.90/131,796.45 = 78,590.70/x
  3. Step 3: Cross multiply
    87,921.90x = 131,796.45 × 78,590.70
  4. Step 4: Simplify right side
    87,921.90x = 10,357,975,263.02
  5. Step 5: Solve for x
    x = 10,357,975,263.02/87,921.90
  6. Step 6: Final answer
    x = 117,808.82

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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.