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Finding the Fourth Proportional to 814.13, 1,221.19 and 540.75

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Solution

The fourth proportional to 814.13, 1,221.19 and 540.75 is: 811.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.13 : 1,221.19 = 540.75 : x
  2. Step 2: Convert to fraction form
    814.13/1,221.19 = 540.75/x
  3. Step 3: Cross multiply
    814.13x = 1,221.19 × 540.75
  4. Step 4: Simplify right side
    814.13x = 660,358.49
  5. Step 5: Solve for x
    x = 660,358.49/814.13
  6. Step 6: Final answer
    x = 811.12

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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.