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Finding the Fourth Proportional to 279.28, 418.77 and 187.87

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Solution

The fourth proportional to 279.28, 418.77 and 187.87 is: 281.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.28 : 418.77 = 187.87 : x
  2. Step 2: Convert to fraction form
    279.28/418.77 = 187.87/x
  3. Step 3: Cross multiply
    279.28x = 418.77 × 187.87
  4. Step 4: Simplify right side
    279.28x = 78,674.32
  5. Step 5: Solve for x
    x = 78,674.32/279.28
  6. Step 6: Final answer
    x = 281.70

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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.