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Finding the Fourth Proportional to 279.16, 415.91 and 265.39

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Solution

The fourth proportional to 279.16, 415.91 and 265.39 is: 395.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.16 : 415.91 = 265.39 : x
  2. Step 2: Convert to fraction form
    279.16/415.91 = 265.39/x
  3. Step 3: Cross multiply
    279.16x = 415.91 × 265.39
  4. Step 4: Simplify right side
    279.16x = 110,378.35
  5. Step 5: Solve for x
    x = 110,378.35/279.16
  6. Step 6: Final answer
    x = 395.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.