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Finding the Fourth Proportional to 742.46, 1,115.30 and 580.46

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Solution

The fourth proportional to 742.46, 1,115.30 and 580.46 is: 871.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.46 : 1,115.30 = 580.46 : x
  2. Step 2: Convert to fraction form
    742.46/1,115.30 = 580.46/x
  3. Step 3: Cross multiply
    742.46x = 1,115.30 × 580.46
  4. Step 4: Simplify right side
    742.46x = 647,378.56
  5. Step 5: Solve for x
    x = 647,378.56/742.46
  6. Step 6: Final answer
    x = 871.94

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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.