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Finding the Fourth Proportional to 814.95, 1,221.19 and 540.06

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Solution

The fourth proportional to 814.95, 1,221.19 and 540.06 is: 809.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.95 : 1,221.19 = 540.06 : x
  2. Step 2: Convert to fraction form
    814.95/1,221.19 = 540.06/x
  3. Step 3: Cross multiply
    814.95x = 1,221.19 × 540.06
  4. Step 4: Simplify right side
    814.95x = 659,515.87
  5. Step 5: Solve for x
    x = 659,515.87/814.95
  6. Step 6: Final answer
    x = 809.27

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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.