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Finding the Fourth Proportional to 308.72, 462.90 and 186.91

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Solution

The fourth proportional to 308.72, 462.90 and 186.91 is: 280.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.72 : 462.90 = 186.91 : x
  2. Step 2: Convert to fraction form
    308.72/462.90 = 186.91/x
  3. Step 3: Cross multiply
    308.72x = 462.90 × 186.91
  4. Step 4: Simplify right side
    308.72x = 86,520.64
  5. Step 5: Solve for x
    x = 86,520.64/308.72
  6. Step 6: Final answer
    x = 280.26

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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.