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Finding the Fourth Proportional to 278.24, 418.32 and 221.18

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Solution

The fourth proportional to 278.24, 418.32 and 221.18 is: 332.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.24 : 418.32 = 221.18 : x
  2. Step 2: Convert to fraction form
    278.24/418.32 = 221.18/x
  3. Step 3: Cross multiply
    278.24x = 418.32 × 221.18
  4. Step 4: Simplify right side
    278.24x = 92,525.06
  5. Step 5: Solve for x
    x = 92,525.06/278.24
  6. Step 6: Final answer
    x = 332.53

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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.