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Finding the Fourth Proportional to 748.42, 1,122.61 and 315.28

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Solution

The fourth proportional to 748.42, 1,122.61 and 315.28 is: 472.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.42 : 1,122.61 = 315.28 : x
  2. Step 2: Convert to fraction form
    748.42/1,122.61 = 315.28/x
  3. Step 3: Cross multiply
    748.42x = 1,122.61 × 315.28
  4. Step 4: Simplify right side
    748.42x = 353,936.48
  5. Step 5: Solve for x
    x = 353,936.48/748.42
  6. Step 6: Final answer
    x = 472.91

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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.