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Finding the Fourth Proportional to 266.25, 397.75 and 212.21

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Solution

The fourth proportional to 266.25, 397.75 and 212.21 is: 317.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.25 : 397.75 = 212.21 : x
  2. Step 2: Convert to fraction form
    266.25/397.75 = 212.21/x
  3. Step 3: Cross multiply
    266.25x = 397.75 × 212.21
  4. Step 4: Simplify right side
    266.25x = 84,404.54
  5. Step 5: Solve for x
    x = 84,404.54/266.25
  6. Step 6: Final answer
    x = 317.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.