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Finding the Fourth Proportional to 667.61, 921.24 and 372.87

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Solution

The fourth proportional to 667.61, 921.24 and 372.87 is: 514.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.61 : 921.24 = 372.87 : x
  2. Step 2: Convert to fraction form
    667.61/921.24 = 372.87/x
  3. Step 3: Cross multiply
    667.61x = 921.24 × 372.87
  4. Step 4: Simplify right side
    667.61x = 343,502.76
  5. Step 5: Solve for x
    x = 343,502.76/667.61
  6. Step 6: Final answer
    x = 514.53

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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.