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Finding the Fourth Proportional to 279.31, 418.93 and 73.90

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Solution

The fourth proportional to 279.31, 418.93 and 73.90 is: 110.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.31 : 418.93 = 73.90 : x
  2. Step 2: Convert to fraction form
    279.31/418.93 = 73.90/x
  3. Step 3: Cross multiply
    279.31x = 418.93 × 73.90
  4. Step 4: Simplify right side
    279.31x = 30,957.69
  5. Step 5: Solve for x
    x = 30,957.69/279.31
  6. Step 6: Final answer
    x = 110.84

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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.