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Finding the Fourth Proportional to 279.16, 418.60 and 116.80

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Solution

The fourth proportional to 279.16, 418.60 and 116.80 is: 175.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.16 : 418.60 = 116.80 : x
  2. Step 2: Convert to fraction form
    279.16/418.60 = 116.80/x
  3. Step 3: Cross multiply
    279.16x = 418.60 × 116.80
  4. Step 4: Simplify right side
    279.16x = 48,892.48
  5. Step 5: Solve for x
    x = 48,892.48/279.16
  6. Step 6: Final answer
    x = 175.14

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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.