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Finding the Fourth Proportional to 921.31, 1,381.97 and 272.05

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Solution

The fourth proportional to 921.31, 1,381.97 and 272.05 is: 408.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.31 : 1,381.97 = 272.05 : x
  2. Step 2: Convert to fraction form
    921.31/1,381.97 = 272.05/x
  3. Step 3: Cross multiply
    921.31x = 1,381.97 × 272.05
  4. Step 4: Simplify right side
    921.31x = 375,964.94
  5. Step 5: Solve for x
    x = 375,964.94/921.31
  6. Step 6: Final answer
    x = 408.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.