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Finding the Fourth Proportional to 266.80, 400.20 and 212.08

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Solution

The fourth proportional to 266.80, 400.20 and 212.08 is: 318.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.80 : 400.20 = 212.08 : x
  2. Step 2: Convert to fraction form
    266.80/400.20 = 212.08/x
  3. Step 3: Cross multiply
    266.80x = 400.20 × 212.08
  4. Step 4: Simplify right side
    266.80x = 84,874.42
  5. Step 5: Solve for x
    x = 84,874.42/266.80
  6. Step 6: Final answer
    x = 318.12

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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.