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Finding the Fourth Proportional to 813.25, 1,219.89 and 293.29

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Solution

The fourth proportional to 813.25, 1,219.89 and 293.29 is: 439.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.25 : 1,219.89 = 293.29 : x
  2. Step 2: Convert to fraction form
    813.25/1,219.89 = 293.29/x
  3. Step 3: Cross multiply
    813.25x = 1,219.89 × 293.29
  4. Step 4: Simplify right side
    813.25x = 357,785.69
  5. Step 5: Solve for x
    x = 357,785.69/813.25
  6. Step 6: Final answer
    x = 439.94

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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.