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Finding the Fourth Proportional to 927.25, 1,391.56 and 440.30

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Solution

The fourth proportional to 927.25, 1,391.56 and 440.30 is: 660.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.25 : 1,391.56 = 440.30 : x
  2. Step 2: Convert to fraction form
    927.25/1,391.56 = 440.30/x
  3. Step 3: Cross multiply
    927.25x = 1,391.56 × 440.30
  4. Step 4: Simplify right side
    927.25x = 612,703.87
  5. Step 5: Solve for x
    x = 612,703.87/927.25
  6. Step 6: Final answer
    x = 660.78

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1.5x scale

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.