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Finding the Fourth Proportional to 927.32, 1,391.04 and 561.78

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Solution

The fourth proportional to 927.32, 1,391.04 and 561.78 is: 842.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.32 : 1,391.04 = 561.78 : x
  2. Step 2: Convert to fraction form
    927.32/1,391.04 = 561.78/x
  3. Step 3: Cross multiply
    927.32x = 1,391.04 × 561.78
  4. Step 4: Simplify right side
    927.32x = 781,458.45
  5. Step 5: Solve for x
    x = 781,458.45/927.32
  6. Step 6: Final answer
    x = 842.71

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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.