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Finding the Fourth Proportional to 279.30, 385.38 and 186.12

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Solution

The fourth proportional to 279.30, 385.38 and 186.12 is: 256.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.30 : 385.38 = 186.12 : x
  2. Step 2: Convert to fraction form
    279.30/385.38 = 186.12/x
  3. Step 3: Cross multiply
    279.30x = 385.38 × 186.12
  4. Step 4: Simplify right side
    279.30x = 71,726.93
  5. Step 5: Solve for x
    x = 71,726.93/279.30
  6. Step 6: Final answer
    x = 256.81

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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.