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Finding the Fourth Proportional to 709.95, 979.38 and 611.53

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Solution

The fourth proportional to 709.95, 979.38 and 611.53 is: 843.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.95 : 979.38 = 611.53 : x
  2. Step 2: Convert to fraction form
    709.95/979.38 = 611.53/x
  3. Step 3: Cross multiply
    709.95x = 979.38 × 611.53
  4. Step 4: Simplify right side
    709.95x = 598,920.25
  5. Step 5: Solve for x
    x = 598,920.25/709.95
  6. Step 6: Final answer
    x = 843.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.