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Finding the Fourth Proportional to 742.92, 1,113.42 and 651.78

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Solution

The fourth proportional to 742.92, 1,113.42 and 651.78 is: 976.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.92 : 1,113.42 = 651.78 : x
  2. Step 2: Convert to fraction form
    742.92/1,113.42 = 651.78/x
  3. Step 3: Cross multiply
    742.92x = 1,113.42 × 651.78
  4. Step 4: Simplify right side
    742.92x = 725,704.89
  5. Step 5: Solve for x
    x = 725,704.89/742.92
  6. Step 6: Final answer
    x = 976.83

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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.