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Finding the Fourth Proportional to 278.60, 418.46 and 242.15

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Solution

The fourth proportional to 278.60, 418.46 and 242.15 is: 363.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.60 : 418.46 = 242.15 : x
  2. Step 2: Convert to fraction form
    278.60/418.46 = 242.15/x
  3. Step 3: Cross multiply
    278.60x = 418.46 × 242.15
  4. Step 4: Simplify right side
    278.60x = 101,326.79
  5. Step 5: Solve for x
    x = 101,326.79/278.60
  6. Step 6: Final answer
    x = 363.71

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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.