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Finding the Fourth Proportional to 764.20, 1,147.85 and 456.66

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Solution

The fourth proportional to 764.20, 1,147.85 and 456.66 is: 685.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.20 : 1,147.85 = 456.66 : x
  2. Step 2: Convert to fraction form
    764.20/1,147.85 = 456.66/x
  3. Step 3: Cross multiply
    764.20x = 1,147.85 × 456.66
  4. Step 4: Simplify right side
    764.20x = 524,177.18
  5. Step 5: Solve for x
    x = 524,177.18/764.20
  6. Step 6: Final answer
    x = 685.92

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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.