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Finding the Fourth Proportional to 667.28, 920.86 and 372.57

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Solution

The fourth proportional to 667.28, 920.86 and 372.57 is: 514.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.28 : 920.86 = 372.57 : x
  2. Step 2: Convert to fraction form
    667.28/920.86 = 372.57/x
  3. Step 3: Cross multiply
    667.28x = 920.86 × 372.57
  4. Step 4: Simplify right side
    667.28x = 343,084.81
  5. Step 5: Solve for x
    x = 343,084.81/667.28
  6. Step 6: Final answer
    x = 514.15

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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.