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Finding the Fourth Proportional to 659.25, 909.79 and 426.78

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Solution

The fourth proportional to 659.25, 909.79 and 426.78 is: 588.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.25 : 909.79 = 426.78 : x
  2. Step 2: Convert to fraction form
    659.25/909.79 = 426.78/x
  3. Step 3: Cross multiply
    659.25x = 909.79 × 426.78
  4. Step 4: Simplify right side
    659.25x = 388,279.11
  5. Step 5: Solve for x
    x = 388,279.11/659.25
  6. Step 6: Final answer
    x = 588.97

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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.