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Finding the Fourth Proportional to 461.40, 691.92 and 211.20

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Solution

The fourth proportional to 461.40, 691.92 and 211.20 is: 316.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.40 : 691.92 = 211.20 : x
  2. Step 2: Convert to fraction form
    461.40/691.92 = 211.20/x
  3. Step 3: Cross multiply
    461.40x = 691.92 × 211.20
  4. Step 4: Simplify right side
    461.40x = 146,133.50
  5. Step 5: Solve for x
    x = 146,133.50/461.40
  6. Step 6: Final answer
    x = 316.72

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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.