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Finding the Fourth Proportional to 928.62, 1,280.79 and 871.92

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Solution

The fourth proportional to 928.62, 1,280.79 and 871.92 is: 1,202.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.62 : 1,280.79 = 871.92 : x
  2. Step 2: Convert to fraction form
    928.62/1,280.79 = 871.92/x
  3. Step 3: Cross multiply
    928.62x = 1,280.79 × 871.92
  4. Step 4: Simplify right side
    928.62x = 1,116,746.42
  5. Step 5: Solve for x
    x = 1,116,746.42/928.62
  6. Step 6: Final answer
    x = 1,202.59

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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.