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Finding the Fourth Proportional to 266.65, 399.24 and 212.59

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Solution

The fourth proportional to 266.65, 399.24 and 212.59 is: 318.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.65 : 399.24 = 212.59 : x
  2. Step 2: Convert to fraction form
    266.65/399.24 = 212.59/x
  3. Step 3: Cross multiply
    266.65x = 399.24 × 212.59
  4. Step 4: Simplify right side
    266.65x = 84,874.43
  5. Step 5: Solve for x
    x = 84,874.43/266.65
  6. Step 6: Final answer
    x = 318.30

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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.