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Finding the Fourth Proportional to 99,243.20, 148,519.20 and 68,139.20

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Solution

The fourth proportional to 99,243.20, 148,519.20 and 68,139.20 is: 101,971.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,243.20 : 148,519.20 = 68,139.20 : x
  2. Step 2: Convert to fraction form
    99,243.20/148,519.20 = 68,139.20/x
  3. Step 3: Cross multiply
    99,243.20x = 148,519.20 × 68,139.20
  4. Step 4: Simplify right side
    99,243.20x = 10,119,979,472.64
  5. Step 5: Solve for x
    x = 10,119,979,472.64/99,243.20
  6. Step 6: Final answer
    x = 101,971.52

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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.