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Finding the Fourth Proportional to 86,599.60, 129,899.40 and 81,350.80

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Solution

The fourth proportional to 86,599.60, 129,899.40 and 81,350.80 is: 122,026.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,599.60 : 129,899.40 = 81,350.80 : x
  2. Step 2: Convert to fraction form
    86,599.60/129,899.40 = 81,350.80/x
  3. Step 3: Cross multiply
    86,599.60x = 129,899.40 × 81,350.80
  4. Step 4: Simplify right side
    86,599.60x = 10,567,420,109.52
  5. Step 5: Solve for x
    x = 10,567,420,109.52/86,599.60
  6. Step 6: Final answer
    x = 122,026.20

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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.