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Finding the Fourth Proportional to 813.22, 1,121.77 and 564.75

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Solution

The fourth proportional to 813.22, 1,121.77 and 564.75 is: 779.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.22 : 1,121.77 = 564.75 : x
  2. Step 2: Convert to fraction form
    813.22/1,121.77 = 564.75/x
  3. Step 3: Cross multiply
    813.22x = 1,121.77 × 564.75
  4. Step 4: Simplify right side
    813.22x = 633,519.61
  5. Step 5: Solve for x
    x = 633,519.61/813.22
  6. Step 6: Final answer
    x = 779.03

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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.