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Finding the Fourth Proportional to 747.42, 1,121.22 and 661.56

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Solution

The fourth proportional to 747.42, 1,121.22 and 661.56 is: 992.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.42 : 1,121.22 = 661.56 : x
  2. Step 2: Convert to fraction form
    747.42/1,121.22 = 661.56/x
  3. Step 3: Cross multiply
    747.42x = 1,121.22 × 661.56
  4. Step 4: Simplify right side
    747.42x = 741,754.30
  5. Step 5: Solve for x
    x = 741,754.30/747.42
  6. Step 6: Final answer
    x = 992.42

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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.