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Finding the Fourth Proportional to 813.79, 1,221.18 and 467.56

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Solution

The fourth proportional to 813.79, 1,221.18 and 467.56 is: 701.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.79 : 1,221.18 = 467.56 : x
  2. Step 2: Convert to fraction form
    813.79/1,221.18 = 467.56/x
  3. Step 3: Cross multiply
    813.79x = 1,221.18 × 467.56
  4. Step 4: Simplify right side
    813.79x = 570,974.92
  5. Step 5: Solve for x
    x = 570,974.92/813.79
  6. Step 6: Final answer
    x = 701.62

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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.