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Finding the Fourth Proportional to 279.27, 418.91 and 261.45

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Solution

The fourth proportional to 279.27, 418.91 and 261.45 is: 392.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.27 : 418.91 = 261.45 : x
  2. Step 2: Convert to fraction form
    279.27/418.91 = 261.45/x
  3. Step 3: Cross multiply
    279.27x = 418.91 × 261.45
  4. Step 4: Simplify right side
    279.27x = 109,522.71
  5. Step 5: Solve for x
    x = 109,522.71/279.27
  6. Step 6: Final answer
    x = 392.18

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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.