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Finding the Fourth Proportional to 461.16, 691.34 and 217.76

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Solution

The fourth proportional to 461.16, 691.34 and 217.76 is: 326.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.16 : 691.34 = 217.76 : x
  2. Step 2: Convert to fraction form
    461.16/691.34 = 217.76/x
  3. Step 3: Cross multiply
    461.16x = 691.34 × 217.76
  4. Step 4: Simplify right side
    461.16x = 150,541.65
  5. Step 5: Solve for x
    x = 150,541.65/461.16
  6. Step 6: Final answer
    x = 326.44

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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.