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Finding the Fourth Proportional to 99,631.76, 149,343.84 and 43,456.79

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Solution

The fourth proportional to 99,631.76, 149,343.84 and 43,456.79 is: 65,139.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,631.76 : 149,343.84 = 43,456.79 : x
  2. Step 2: Convert to fraction form
    99,631.76/149,343.84 = 43,456.79/x
  3. Step 3: Cross multiply
    99,631.76x = 149,343.84 × 43,456.79
  4. Step 4: Simplify right side
    99,631.76x = 6,490,003,145.95
  5. Step 5: Solve for x
    x = 6,490,003,145.95/99,631.76
  6. Step 6: Final answer
    x = 65,139.91

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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.