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Finding the Fourth Proportional to 748.36, 1,114.72 and 721.60

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Solution

The fourth proportional to 748.36, 1,114.72 and 721.60 is: 1,074.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.36 : 1,114.72 = 721.60 : x
  2. Step 2: Convert to fraction form
    748.36/1,114.72 = 721.60/x
  3. Step 3: Cross multiply
    748.36x = 1,114.72 × 721.60
  4. Step 4: Simplify right side
    748.36x = 804,381.95
  5. Step 5: Solve for x
    x = 804,381.95/748.36
  6. Step 6: Final answer
    x = 1,074.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.