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Finding the Fourth Proportional to 816.90, 1,223.55 and 725.70

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Solution

The fourth proportional to 816.90, 1,223.55 and 725.70 is: 1,086.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.90 : 1,223.55 = 725.70 : x
  2. Step 2: Convert to fraction form
    816.90/1,223.55 = 725.70/x
  3. Step 3: Cross multiply
    816.90x = 1,223.55 × 725.70
  4. Step 4: Simplify right side
    816.90x = 887,930.24
  5. Step 5: Solve for x
    x = 887,930.24/816.90
  6. Step 6: Final answer
    x = 1,086.95

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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.