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Finding the Fourth Proportional to 1,159.56, 1,740.20 and 721.44

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Solution

The fourth proportional to 1,159.56, 1,740.20 and 721.44 is: 1,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.56 : 1,740.20 = 721.44 : x
  2. Step 2: Convert to fraction form
    1,159.56/1,740.20 = 721.44/x
  3. Step 3: Cross multiply
    1,159.56x = 1,740.20 × 721.44
  4. Step 4: Simplify right side
    1,159.56x = 1,255,453.71
  5. Step 5: Solve for x
    x = 1,255,453.71/1,159.56
  6. Step 6: Final answer
    x = 1,082.70

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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.