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Finding the Fourth Proportional to 816.80, 1,126.91 and 522.24

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Solution

The fourth proportional to 816.80, 1,126.91 and 522.24 is: 720.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.80 : 1,126.91 = 522.24 : x
  2. Step 2: Convert to fraction form
    816.80/1,126.91 = 522.24/x
  3. Step 3: Cross multiply
    816.80x = 1,126.91 × 522.24
  4. Step 4: Simplify right side
    816.80x = 588,517.48
  5. Step 5: Solve for x
    x = 588,517.48/816.80
  6. Step 6: Final answer
    x = 720.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.