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Finding the Fourth Proportional to 869.92, 1,305 and 292.72

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Solution

The fourth proportional to 869.92, 1,305 and 292.72 is: 439.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.92 : 1,305 = 292.72 : x
  2. Step 2: Convert to fraction form
    869.92/1,305 = 292.72/x
  3. Step 3: Cross multiply
    869.92x = 1,305 × 292.72
  4. Step 4: Simplify right side
    869.92x = 381,999.60
  5. Step 5: Solve for x
    x = 381,999.60/869.92
  6. Step 6: Final answer
    x = 439.12

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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.