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Finding the Fourth Proportional to 921.47, 1,380.96 and 401.31

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Solution

The fourth proportional to 921.47, 1,380.96 and 401.31 is: 601.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.47 : 1,380.96 = 401.31 : x
  2. Step 2: Convert to fraction form
    921.47/1,380.96 = 401.31/x
  3. Step 3: Cross multiply
    921.47x = 1,380.96 × 401.31
  4. Step 4: Simplify right side
    921.47x = 554,193.06
  5. Step 5: Solve for x
    x = 554,193.06/921.47
  6. Step 6: Final answer
    x = 601.43

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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.