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Finding the Fourth Proportional to 86,680.60, 130,020.90 and 81,431.80

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Solution

The fourth proportional to 86,680.60, 130,020.90 and 81,431.80 is: 122,147.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,680.60 : 130,020.90 = 81,431.80 : x
  2. Step 2: Convert to fraction form
    86,680.60/130,020.90 = 81,431.80/x
  3. Step 3: Cross multiply
    86,680.60x = 130,020.90 × 81,431.80
  4. Step 4: Simplify right side
    86,680.60x = 10,587,835,924.62
  5. Step 5: Solve for x
    x = 10,587,835,924.62/86,680.60
  6. Step 6: Final answer
    x = 122,147.70

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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.