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Finding the Fourth Proportional to 279.40, 418.88 and 251.72

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Solution

The fourth proportional to 279.40, 418.88 and 251.72 is: 377.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.40 : 418.88 = 251.72 : x
  2. Step 2: Convert to fraction form
    279.40/418.88 = 251.72/x
  3. Step 3: Cross multiply
    279.40x = 418.88 × 251.72
  4. Step 4: Simplify right side
    279.40x = 105,440.47
  5. Step 5: Solve for x
    x = 105,440.47/279.40
  6. Step 6: Final answer
    x = 377.38

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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.