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Finding the Fourth Proportional to 709.43, 978.86 and 414.70

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Solution

The fourth proportional to 709.43, 978.86 and 414.70 is: 572.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.43 : 978.86 = 414.70 : x
  2. Step 2: Convert to fraction form
    709.43/978.86 = 414.70/x
  3. Step 3: Cross multiply
    709.43x = 978.86 × 414.70
  4. Step 4: Simplify right side
    709.43x = 405,933.24
  5. Step 5: Solve for x
    x = 405,933.24/709.43
  6. Step 6: Final answer
    x = 572.20

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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.