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Finding the Fourth Proportional to 709.26, 1,063.88 and 319.19

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Solution

The fourth proportional to 709.26, 1,063.88 and 319.19 is: 478.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.26 : 1,063.88 = 319.19 : x
  2. Step 2: Convert to fraction form
    709.26/1,063.88 = 319.19/x
  3. Step 3: Cross multiply
    709.26x = 1,063.88 × 319.19
  4. Step 4: Simplify right side
    709.26x = 339,581.92
  5. Step 5: Solve for x
    x = 339,581.92/709.26
  6. Step 6: Final answer
    x = 478.79

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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.