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Finding the Fourth Proportional to 764.67, 1,146.38 and 721.74

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Solution

The fourth proportional to 764.67, 1,146.38 and 721.74 is: 1,082.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.67 : 1,146.38 = 721.74 : x
  2. Step 2: Convert to fraction form
    764.67/1,146.38 = 721.74/x
  3. Step 3: Cross multiply
    764.67x = 1,146.38 × 721.74
  4. Step 4: Simplify right side
    764.67x = 827,384.69
  5. Step 5: Solve for x
    x = 827,384.69/764.67
  6. Step 6: Final answer
    x = 1,082.02

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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.