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Finding the Fourth Proportional to 813.52, 1,220.56 and 265.80

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Solution

The fourth proportional to 813.52, 1,220.56 and 265.80 is: 398.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.52 : 1,220.56 = 265.80 : x
  2. Step 2: Convert to fraction form
    813.52/1,220.56 = 265.80/x
  3. Step 3: Cross multiply
    813.52x = 1,220.56 × 265.80
  4. Step 4: Simplify right side
    813.52x = 324,424.85
  5. Step 5: Solve for x
    x = 324,424.85/813.52
  6. Step 6: Final answer
    x = 398.79

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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.