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Finding the Fourth Proportional to 748.51, 1,123.17 and 721.24

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Solution

The fourth proportional to 748.51, 1,123.17 and 721.24 is: 1,082.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.51 : 1,123.17 = 721.24 : x
  2. Step 2: Convert to fraction form
    748.51/1,123.17 = 721.24/x
  3. Step 3: Cross multiply
    748.51x = 1,123.17 × 721.24
  4. Step 4: Simplify right side
    748.51x = 810,075.13
  5. Step 5: Solve for x
    x = 810,075.13/748.51
  6. Step 6: Final answer
    x = 1,082.25

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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.