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Finding the Fourth Proportional to 99,608.72, 137,474.66 and 65,611.76

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Solution

The fourth proportional to 99,608.72, 137,474.66 and 65,611.76 is: 90,553.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,608.72 : 137,474.66 = 65,611.76 : x
  2. Step 2: Convert to fraction form
    99,608.72/137,474.66 = 65,611.76/x
  3. Step 3: Cross multiply
    99,608.72x = 137,474.66 × 65,611.76
  4. Step 4: Simplify right side
    99,608.72x = 9,019,953,874.66
  5. Step 5: Solve for x
    x = 9,019,953,874.66/99,608.72
  6. Step 6: Final answer
    x = 90,553.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.