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Finding the Fourth Proportional to 814.90, 1,221.97 and 294.80

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Solution

The fourth proportional to 814.90, 1,221.97 and 294.80 is: 442.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.90 : 1,221.97 = 294.80 : x
  2. Step 2: Convert to fraction form
    814.90/1,221.97 = 294.80/x
  3. Step 3: Cross multiply
    814.90x = 1,221.97 × 294.80
  4. Step 4: Simplify right side
    814.90x = 360,236.76
  5. Step 5: Solve for x
    x = 360,236.76/814.90
  6. Step 6: Final answer
    x = 442.06

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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.