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Finding the Fourth Proportional to 813.10, 1,122.16 and 481.36

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Solution

The fourth proportional to 813.10, 1,122.16 and 481.36 is: 664.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.10 : 1,122.16 = 481.36 : x
  2. Step 2: Convert to fraction form
    813.10/1,122.16 = 481.36/x
  3. Step 3: Cross multiply
    813.10x = 1,122.16 × 481.36
  4. Step 4: Simplify right side
    813.10x = 540,162.94
  5. Step 5: Solve for x
    x = 540,162.94/813.10
  6. Step 6: Final answer
    x = 664.33

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Half scale
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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.