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Finding the Fourth Proportional to 808.11, 1,115.55 and 611.67

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Solution

The fourth proportional to 808.11, 1,115.55 and 611.67 is: 844.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.11 : 1,115.55 = 611.67 : x
  2. Step 2: Convert to fraction form
    808.11/1,115.55 = 611.67/x
  3. Step 3: Cross multiply
    808.11x = 1,115.55 × 611.67
  4. Step 4: Simplify right side
    808.11x = 682,348.47
  5. Step 5: Solve for x
    x = 682,348.47/808.11
  6. Step 6: Final answer
    x = 844.38

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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.