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Finding the Fourth Proportional to 927.64, 1,392.90 and 842.68

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Solution

The fourth proportional to 927.64, 1,392.90 and 842.68 is: 1,265.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.64 : 1,392.90 = 842.68 : x
  2. Step 2: Convert to fraction form
    927.64/1,392.90 = 842.68/x
  3. Step 3: Cross multiply
    927.64x = 1,392.90 × 842.68
  4. Step 4: Simplify right side
    927.64x = 1,173,768.97
  5. Step 5: Solve for x
    x = 1,173,768.97/927.64
  6. Step 6: Final answer
    x = 1,265.33

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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.