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Finding the Fourth Proportional to 278.84, 418.59 and 221.76

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Solution

The fourth proportional to 278.84, 418.59 and 221.76 is: 332.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.84 : 418.59 = 221.76 : x
  2. Step 2: Convert to fraction form
    278.84/418.59 = 221.76/x
  3. Step 3: Cross multiply
    278.84x = 418.59 × 221.76
  4. Step 4: Simplify right side
    278.84x = 92,828.32
  5. Step 5: Solve for x
    x = 92,828.32/278.84
  6. Step 6: Final answer
    x = 332.91

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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.