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Finding the Fourth Proportional to 709.28, 1,064.28 and 324.48

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Solution

The fourth proportional to 709.28, 1,064.28 and 324.48 is: 486.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.28 : 1,064.28 = 324.48 : x
  2. Step 2: Convert to fraction form
    709.28/1,064.28 = 324.48/x
  3. Step 3: Cross multiply
    709.28x = 1,064.28 × 324.48
  4. Step 4: Simplify right side
    709.28x = 345,337.57
  5. Step 5: Solve for x
    x = 345,337.57/709.28
  6. Step 6: Final answer
    x = 486.88

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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.