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Finding the Fourth Proportional to 881.91, 1,218.56 and 771.21

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Solution

The fourth proportional to 881.91, 1,218.56 and 771.21 is: 1,065.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.91 : 1,218.56 = 771.21 : x
  2. Step 2: Convert to fraction form
    881.91/1,218.56 = 771.21/x
  3. Step 3: Cross multiply
    881.91x = 1,218.56 × 771.21
  4. Step 4: Simplify right side
    881.91x = 939,761.80
  5. Step 5: Solve for x
    x = 939,761.80/881.91
  6. Step 6: Final answer
    x = 1,065.60

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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.