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Finding the Fourth Proportional to 279.40, 418.62 and 264.20

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Solution

The fourth proportional to 279.40, 418.62 and 264.20 is: 395.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.40 : 418.62 = 264.20 : x
  2. Step 2: Convert to fraction form
    279.40/418.62 = 264.20/x
  3. Step 3: Cross multiply
    279.40x = 418.62 × 264.20
  4. Step 4: Simplify right side
    279.40x = 110,599.40
  5. Step 5: Solve for x
    x = 110,599.40/279.40
  6. Step 6: Final answer
    x = 395.85

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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.