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Finding the Fourth Proportional to 667.61, 921.15 and 372.86

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Solution

The fourth proportional to 667.61, 921.15 and 372.86 is: 514.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.61 : 921.15 = 372.86 : x
  2. Step 2: Convert to fraction form
    667.61/921.15 = 372.86/x
  3. Step 3: Cross multiply
    667.61x = 921.15 × 372.86
  4. Step 4: Simplify right side
    667.61x = 343,462.29
  5. Step 5: Solve for x
    x = 343,462.29/667.61
  6. Step 6: Final answer
    x = 514.47

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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.