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Finding the Fourth Proportional to 871.92, 1,306.08 and 628.92

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Solution

The fourth proportional to 871.92, 1,306.08 and 628.92 is: 942.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.92 : 1,306.08 = 628.92 : x
  2. Step 2: Convert to fraction form
    871.92/1,306.08 = 628.92/x
  3. Step 3: Cross multiply
    871.92x = 1,306.08 × 628.92
  4. Step 4: Simplify right side
    871.92x = 821,419.83
  5. Step 5: Solve for x
    x = 821,419.83/871.92
  6. Step 6: Final answer
    x = 942.08

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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.