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Finding the Fourth Proportional to 86,781.39, 130,245.80 and 61,882.40

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Solution

The fourth proportional to 86,781.39, 130,245.80 and 61,882.40 is: 92,876.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,781.39 : 130,245.80 = 61,882.40 : x
  2. Step 2: Convert to fraction form
    86,781.39/130,245.80 = 61,882.40/x
  3. Step 3: Cross multiply
    86,781.39x = 130,245.80 × 61,882.40
  4. Step 4: Simplify right side
    86,781.39x = 8,059,921,733.28
  5. Step 5: Solve for x
    x = 8,059,921,733.28/86,781.39
  6. Step 6: Final answer
    x = 92,876.15

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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.