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Finding the Fourth Proportional to 816.36, 1,126.89 and 521.88

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Solution

The fourth proportional to 816.36, 1,126.89 and 521.88 is: 720.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.36 : 1,126.89 = 521.88 : x
  2. Step 2: Convert to fraction form
    816.36/1,126.89 = 521.88/x
  3. Step 3: Cross multiply
    816.36x = 1,126.89 × 521.88
  4. Step 4: Simplify right side
    816.36x = 588,101.35
  5. Step 5: Solve for x
    x = 588,101.35/816.36
  6. Step 6: Final answer
    x = 720.39

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1.5x scale

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.