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Finding the Fourth Proportional to 709.38, 1,064.31 and 247.28

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Solution

The fourth proportional to 709.38, 1,064.31 and 247.28 is: 370.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.38 : 1,064.31 = 247.28 : x
  2. Step 2: Convert to fraction form
    709.38/1,064.31 = 247.28/x
  3. Step 3: Cross multiply
    709.38x = 1,064.31 × 247.28
  4. Step 4: Simplify right side
    709.38x = 263,176.02
  5. Step 5: Solve for x
    x = 263,176.02/709.38
  6. Step 6: Final answer
    x = 370.99

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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.