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Finding the Fourth Proportional to 278.78, 418.20 and 96.15

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Solution

The fourth proportional to 278.78, 418.20 and 96.15 is: 144.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.78 : 418.20 = 96.15 : x
  2. Step 2: Convert to fraction form
    278.78/418.20 = 96.15/x
  3. Step 3: Cross multiply
    278.78x = 418.20 × 96.15
  4. Step 4: Simplify right side
    278.78x = 40,209.45
  5. Step 5: Solve for x
    x = 40,209.45/278.78
  6. Step 6: Final answer
    x = 144.24

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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.