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Finding the Fourth Proportional to 280.86, 386.82 and 231.72

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Solution

The fourth proportional to 280.86, 386.82 and 231.72 is: 319.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.86 : 386.82 = 231.72 : x
  2. Step 2: Convert to fraction form
    280.86/386.82 = 231.72/x
  3. Step 3: Cross multiply
    280.86x = 386.82 × 231.72
  4. Step 4: Simplify right side
    280.86x = 89,633.93
  5. Step 5: Solve for x
    x = 89,633.93/280.86
  6. Step 6: Final answer
    x = 319.14

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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.