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Finding the Fourth Proportional to 278.96, 418.68 and 108.08

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Solution

The fourth proportional to 278.96, 418.68 and 108.08 is: 162.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.96 : 418.68 = 108.08 : x
  2. Step 2: Convert to fraction form
    278.96/418.68 = 108.08/x
  3. Step 3: Cross multiply
    278.96x = 418.68 × 108.08
  4. Step 4: Simplify right side
    278.96x = 45,250.93
  5. Step 5: Solve for x
    x = 45,250.93/278.96
  6. Step 6: Final answer
    x = 162.21

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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.