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Finding the Fourth Proportional to 808.38, 1,115.10 and 611.28

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Solution

The fourth proportional to 808.38, 1,115.10 and 611.28 is: 843.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.38 : 1,115.10 = 611.28 : x
  2. Step 2: Convert to fraction form
    808.38/1,115.10 = 611.28/x
  3. Step 3: Cross multiply
    808.38x = 1,115.10 × 611.28
  4. Step 4: Simplify right side
    808.38x = 681,638.33
  5. Step 5: Solve for x
    x = 681,638.33/808.38
  6. Step 6: Final answer
    x = 843.22

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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.