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Finding the Fourth Proportional to 279.42, 418.92 and 117.15

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Solution

The fourth proportional to 279.42, 418.92 and 117.15 is: 175.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.42 : 418.92 = 117.15 : x
  2. Step 2: Convert to fraction form
    279.42/418.92 = 117.15/x
  3. Step 3: Cross multiply
    279.42x = 418.92 × 117.15
  4. Step 4: Simplify right side
    279.42x = 49,076.48
  5. Step 5: Solve for x
    x = 49,076.48/279.42
  6. Step 6: Final answer
    x = 175.64

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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.