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Finding the Fourth Proportional to 659.20, 909.41 and 397.07

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Solution

The fourth proportional to 659.20, 909.41 and 397.07 is: 547.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.20 : 909.41 = 397.07 : x
  2. Step 2: Convert to fraction form
    659.20/909.41 = 397.07/x
  3. Step 3: Cross multiply
    659.20x = 909.41 × 397.07
  4. Step 4: Simplify right side
    659.20x = 361,094.88
  5. Step 5: Solve for x
    x = 361,094.88/659.20
  6. Step 6: Final answer
    x = 547.78

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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.