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Finding the Fourth Proportional to 659.17, 909.80 and 379.45

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Solution

The fourth proportional to 659.17, 909.80 and 379.45 is: 523.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.17 : 909.80 = 379.45 : x
  2. Step 2: Convert to fraction form
    659.17/909.80 = 379.45/x
  3. Step 3: Cross multiply
    659.17x = 909.80 × 379.45
  4. Step 4: Simplify right side
    659.17x = 345,223.61
  5. Step 5: Solve for x
    x = 345,223.61/659.17
  6. Step 6: Final answer
    x = 523.72

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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.