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Finding the Fourth Proportional to 462.10, 691.80 and 308.20

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Solution

The fourth proportional to 462.10, 691.80 and 308.20 is: 461.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.10 : 691.80 = 308.20 : x
  2. Step 2: Convert to fraction form
    462.10/691.80 = 308.20/x
  3. Step 3: Cross multiply
    462.10x = 691.80 × 308.20
  4. Step 4: Simplify right side
    462.10x = 213,212.76
  5. Step 5: Solve for x
    x = 213,212.76/462.10
  6. Step 6: Final answer
    x = 461.40

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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.