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Finding the Fourth Proportional to 461.06, 691.86 and 278.90

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Solution

The fourth proportional to 461.06, 691.86 and 278.90 is: 418.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.06 : 691.86 = 278.90 : x
  2. Step 2: Convert to fraction form
    461.06/691.86 = 278.90/x
  3. Step 3: Cross multiply
    461.06x = 691.86 × 278.90
  4. Step 4: Simplify right side
    461.06x = 192,959.75
  5. Step 5: Solve for x
    x = 192,959.75/461.06
  6. Step 6: Final answer
    x = 418.51

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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.