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Finding the Fourth Proportional to 921.38, 1,382.67 and 452.79

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Solution

The fourth proportional to 921.38, 1,382.67 and 452.79 is: 679.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,382.67 = 452.79 : x
  2. Step 2: Convert to fraction form
    921.38/1,382.67 = 452.79/x
  3. Step 3: Cross multiply
    921.38x = 1,382.67 × 452.79
  4. Step 4: Simplify right side
    921.38x = 626,059.15
  5. Step 5: Solve for x
    x = 626,059.15/921.38
  6. Step 6: Final answer
    x = 679.48

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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.