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Finding the Fourth Proportional to 86,648.60, 129,713.70 and 81,522.20

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Solution

The fourth proportional to 86,648.60, 129,713.70 and 81,522.20 is: 122,039.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,648.60 : 129,713.70 = 81,522.20 : x
  2. Step 2: Convert to fraction form
    86,648.60/129,713.70 = 81,522.20/x
  3. Step 3: Cross multiply
    86,648.60x = 129,713.70 × 81,522.20
  4. Step 4: Simplify right side
    86,648.60x = 10,574,546,194.14
  5. Step 5: Solve for x
    x = 10,574,546,194.14/86,648.60
  6. Step 6: Final answer
    x = 122,039.44

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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.