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Finding the Fourth Proportional to 813.78, 1,220.65 and 197.48

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Solution

The fourth proportional to 813.78, 1,220.65 and 197.48 is: 296.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.78 : 1,220.65 = 197.48 : x
  2. Step 2: Convert to fraction form
    813.78/1,220.65 = 197.48/x
  3. Step 3: Cross multiply
    813.78x = 1,220.65 × 197.48
  4. Step 4: Simplify right side
    813.78x = 241,052.68
  5. Step 5: Solve for x
    x = 241,052.68/813.78
  6. Step 6: Final answer
    x = 296.21

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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.