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Finding the Fourth Proportional to 817.97, 1,229.78 and 656.78

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Solution

The fourth proportional to 817.97, 1,229.78 and 656.78 is: 987.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.97 : 1,229.78 = 656.78 : x
  2. Step 2: Convert to fraction form
    817.97/1,229.78 = 656.78/x
  3. Step 3: Cross multiply
    817.97x = 1,229.78 × 656.78
  4. Step 4: Simplify right side
    817.97x = 807,690.40
  5. Step 5: Solve for x
    x = 807,690.40/817.97
  6. Step 6: Final answer
    x = 987.44

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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.