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Finding the Fourth Proportional to 808.11, 1,115.20 and 631.27

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Solution

The fourth proportional to 808.11, 1,115.20 and 631.27 is: 871.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.11 : 1,115.20 = 631.27 : x
  2. Step 2: Convert to fraction form
    808.11/1,115.20 = 631.27/x
  3. Step 3: Cross multiply
    808.11x = 1,115.20 × 631.27
  4. Step 4: Simplify right side
    808.11x = 703,992.30
  5. Step 5: Solve for x
    x = 703,992.30/808.11
  6. Step 6: Final answer
    x = 871.16

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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.