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Finding the Fourth Proportional to 772.70, 1,159.11 and 217.41

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Solution

The fourth proportional to 772.70, 1,159.11 and 217.41 is: 326.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.70 : 1,159.11 = 217.41 : x
  2. Step 2: Convert to fraction form
    772.70/1,159.11 = 217.41/x
  3. Step 3: Cross multiply
    772.70x = 1,159.11 × 217.41
  4. Step 4: Simplify right side
    772.70x = 252,002.11
  5. Step 5: Solve for x
    x = 252,002.11/772.70
  6. Step 6: Final answer
    x = 326.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.