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Finding the Fourth Proportional to 667.61, 921.29 and 372.90

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Solution

The fourth proportional to 667.61, 921.29 and 372.90 is: 514.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.61 : 921.29 = 372.90 : x
  2. Step 2: Convert to fraction form
    667.61/921.29 = 372.90/x
  3. Step 3: Cross multiply
    667.61x = 921.29 × 372.90
  4. Step 4: Simplify right side
    667.61x = 343,547.18
  5. Step 5: Solve for x
    x = 343,547.18/667.61
  6. Step 6: Final answer
    x = 514.60

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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.