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Finding the Fourth Proportional to 813.20, 1,122.12 and 481.55

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Solution

The fourth proportional to 813.20, 1,122.12 and 481.55 is: 664.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.20 : 1,122.12 = 481.55 : x
  2. Step 2: Convert to fraction form
    813.20/1,122.12 = 481.55/x
  3. Step 3: Cross multiply
    813.20x = 1,122.12 × 481.55
  4. Step 4: Simplify right side
    813.20x = 540,354.48
  5. Step 5: Solve for x
    x = 540,354.48/813.20
  6. Step 6: Final answer
    x = 664.48

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.