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Finding the Fourth Proportional to 748.02, 1,122.17 and 315.48

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Solution

The fourth proportional to 748.02, 1,122.17 and 315.48 is: 473.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.02 : 1,122.17 = 315.48 : x
  2. Step 2: Convert to fraction form
    748.02/1,122.17 = 315.48/x
  3. Step 3: Cross multiply
    748.02x = 1,122.17 × 315.48
  4. Step 4: Simplify right side
    748.02x = 354,020.61
  5. Step 5: Solve for x
    x = 354,020.61/748.02
  6. Step 6: Final answer
    x = 473.28

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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.