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Finding the Fourth Proportional to 99,531.20, 149,296.80 and 86,700.80

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Solution

The fourth proportional to 99,531.20, 149,296.80 and 86,700.80 is: 130,051.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,531.20 : 149,296.80 = 86,700.80 : x
  2. Step 2: Convert to fraction form
    99,531.20/149,296.80 = 86,700.80/x
  3. Step 3: Cross multiply
    99,531.20x = 149,296.80 × 86,700.80
  4. Step 4: Simplify right side
    99,531.20x = 12,944,151,997.44
  5. Step 5: Solve for x
    x = 12,944,151,997.44/99,531.20
  6. Step 6: Final answer
    x = 130,051.20

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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.