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Finding the Fourth Proportional to 748.30, 1,122.55 and 261.24

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Solution

The fourth proportional to 748.30, 1,122.55 and 261.24 is: 391.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.30 : 1,122.55 = 261.24 : x
  2. Step 2: Convert to fraction form
    748.30/1,122.55 = 261.24/x
  3. Step 3: Cross multiply
    748.30x = 1,122.55 × 261.24
  4. Step 4: Simplify right side
    748.30x = 293,250.10
  5. Step 5: Solve for x
    x = 293,250.10/748.30
  6. Step 6: Final answer
    x = 391.89

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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.