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Finding the Fourth Proportional to 881.36, 1,213.32 and 808.40

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Solution

The fourth proportional to 881.36, 1,213.32 and 808.40 is: 1,112.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.36 : 1,213.32 = 808.40 : x
  2. Step 2: Convert to fraction form
    881.36/1,213.32 = 808.40/x
  3. Step 3: Cross multiply
    881.36x = 1,213.32 × 808.40
  4. Step 4: Simplify right side
    881.36x = 980,847.89
  5. Step 5: Solve for x
    x = 980,847.89/881.36
  6. Step 6: Final answer
    x = 1,112.88

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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.