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Finding the Fourth Proportional to 1,747.44, 2,621.64 and 721.20

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Solution

The fourth proportional to 1,747.44, 2,621.64 and 721.20 is: 1,082.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,747.44 : 2,621.64 = 721.20 : x
  2. Step 2: Convert to fraction form
    1,747.44/2,621.64 = 721.20/x
  3. Step 3: Cross multiply
    1,747.44x = 2,621.64 × 721.20
  4. Step 4: Simplify right side
    1,747.44x = 1,890,726.77
  5. Step 5: Solve for x
    x = 1,890,726.77/1,747.44
  6. Step 6: Final answer
    x = 1,082.00

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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.