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Finding the Fourth Proportional to 460.80, 691.02 and 287.21

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Solution

The fourth proportional to 460.80, 691.02 and 287.21 is: 430.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.80 : 691.02 = 287.21 : x
  2. Step 2: Convert to fraction form
    460.80/691.02 = 287.21/x
  3. Step 3: Cross multiply
    460.80x = 691.02 × 287.21
  4. Step 4: Simplify right side
    460.80x = 198,469.58
  5. Step 5: Solve for x
    x = 198,469.58/460.80
  6. Step 6: Final answer
    x = 430.71

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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.