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Finding the Fourth Proportional to 99,520.80, 149,281.20 and 79,837.80

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Solution

The fourth proportional to 99,520.80, 149,281.20 and 79,837.80 is: 119,756.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,520.80 : 149,281.20 = 79,837.80 : x
  2. Step 2: Convert to fraction form
    99,520.80/149,281.20 = 79,837.80/x
  3. Step 3: Cross multiply
    99,520.80x = 149,281.20 × 79,837.80
  4. Step 4: Simplify right side
    99,520.80x = 11,918,282,589.36
  5. Step 5: Solve for x
    x = 11,918,282,589.36/99,520.80
  6. Step 6: Final answer
    x = 119,756.70

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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.