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Finding the Fourth Proportional to 842.60, 1,162.92 and 815.28

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Solution

The fourth proportional to 842.60, 1,162.92 and 815.28 is: 1,125.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.60 : 1,162.92 = 815.28 : x
  2. Step 2: Convert to fraction form
    842.60/1,162.92 = 815.28/x
  3. Step 3: Cross multiply
    842.60x = 1,162.92 × 815.28
  4. Step 4: Simplify right side
    842.60x = 948,105.42
  5. Step 5: Solve for x
    x = 948,105.42/842.60
  6. Step 6: Final answer
    x = 1,125.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.