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Finding the Fourth Proportional to 353.11, 487.26 and 279.61

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Solution

The fourth proportional to 353.11, 487.26 and 279.61 is: 385.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.11 : 487.26 = 279.61 : x
  2. Step 2: Convert to fraction form
    353.11/487.26 = 279.61/x
  3. Step 3: Cross multiply
    353.11x = 487.26 × 279.61
  4. Step 4: Simplify right side
    353.11x = 136,242.77
  5. Step 5: Solve for x
    x = 136,242.77/353.11
  6. Step 6: Final answer
    x = 385.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.