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Finding the Fourth Proportional to 667.26, 920.86 and 387.59

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Solution

The fourth proportional to 667.26, 920.86 and 387.59 is: 534.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.26 : 920.86 = 387.59 : x
  2. Step 2: Convert to fraction form
    667.26/920.86 = 387.59/x
  3. Step 3: Cross multiply
    667.26x = 920.86 × 387.59
  4. Step 4: Simplify right side
    667.26x = 356,910.55
  5. Step 5: Solve for x
    x = 356,910.55/667.26
  6. Step 6: Final answer
    x = 534.89

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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.