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Finding the Fourth Proportional to 866.52, 1,299.92 and 319.48

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Solution

The fourth proportional to 866.52, 1,299.92 and 319.48 is: 479.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.52 : 1,299.92 = 319.48 : x
  2. Step 2: Convert to fraction form
    866.52/1,299.92 = 319.48/x
  3. Step 3: Cross multiply
    866.52x = 1,299.92 × 319.48
  4. Step 4: Simplify right side
    866.52x = 415,298.44
  5. Step 5: Solve for x
    x = 415,298.44/866.52
  6. Step 6: Final answer
    x = 479.27

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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.