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Finding the Fourth Proportional to 709.60, 979.32 and 414.86

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Solution

The fourth proportional to 709.60, 979.32 and 414.86 is: 572.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.60 : 979.32 = 414.86 : x
  2. Step 2: Convert to fraction form
    709.60/979.32 = 414.86/x
  3. Step 3: Cross multiply
    709.60x = 979.32 × 414.86
  4. Step 4: Simplify right side
    709.60x = 406,280.70
  5. Step 5: Solve for x
    x = 406,280.70/709.60
  6. Step 6: Final answer
    x = 572.55

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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.