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Finding the Fourth Proportional to 99,043.20, 148,564.80 and 72,799.20

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Solution

The fourth proportional to 99,043.20, 148,564.80 and 72,799.20 is: 109,198.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,043.20 : 148,564.80 = 72,799.20 : x
  2. Step 2: Convert to fraction form
    99,043.20/148,564.80 = 72,799.20/x
  3. Step 3: Cross multiply
    99,043.20x = 148,564.80 × 72,799.20
  4. Step 4: Simplify right side
    99,043.20x = 10,815,398,588.16
  5. Step 5: Solve for x
    x = 10,815,398,588.16/99,043.20
  6. Step 6: Final answer
    x = 109,198.80

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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.