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Finding the Fourth Proportional to 279.18, 418.76 and 73.78

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Solution

The fourth proportional to 279.18, 418.76 and 73.78 is: 110.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.18 : 418.76 = 73.78 : x
  2. Step 2: Convert to fraction form
    279.18/418.76 = 73.78/x
  3. Step 3: Cross multiply
    279.18x = 418.76 × 73.78
  4. Step 4: Simplify right side
    279.18x = 30,894.97
  5. Step 5: Solve for x
    x = 30,894.97/279.18
  6. Step 6: Final answer
    x = 110.66

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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.