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Finding the Fourth Proportional to 99,100.80, 148,651.20 and 87,436.80

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Solution

The fourth proportional to 99,100.80, 148,651.20 and 87,436.80 is: 131,155.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,100.80 : 148,651.20 = 87,436.80 : x
  2. Step 2: Convert to fraction form
    99,100.80/148,651.20 = 87,436.80/x
  3. Step 3: Cross multiply
    99,100.80x = 148,651.20 × 87,436.80
  4. Step 4: Simplify right side
    99,100.80x = 12,997,585,244.16
  5. Step 5: Solve for x
    x = 12,997,585,244.16/99,100.80
  6. Step 6: Final answer
    x = 131,155.20

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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.