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Finding the Fourth Proportional to 871.68, 1,306.88 and 816.64

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Solution

The fourth proportional to 871.68, 1,306.88 and 816.64 is: 1,224.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.68 : 1,306.88 = 816.64 : x
  2. Step 2: Convert to fraction form
    871.68/1,306.88 = 816.64/x
  3. Step 3: Cross multiply
    871.68x = 1,306.88 × 816.64
  4. Step 4: Simplify right side
    871.68x = 1,067,250.48
  5. Step 5: Solve for x
    x = 1,067,250.48/871.68
  6. Step 6: Final answer
    x = 1,224.36

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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.