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Finding the Fourth Proportional to 709.59, 979.32 and 414.80

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Solution

The fourth proportional to 709.59, 979.32 and 414.80 is: 572.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.59 : 979.32 = 414.80 : x
  2. Step 2: Convert to fraction form
    709.59/979.32 = 414.80/x
  3. Step 3: Cross multiply
    709.59x = 979.32 × 414.80
  4. Step 4: Simplify right side
    709.59x = 406,217.04
  5. Step 5: Solve for x
    x = 406,217.04/709.59
  6. Step 6: Final answer
    x = 572.47

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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.