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Finding the Fourth Proportional to 266.45, 397.99 and 212.18

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Solution

The fourth proportional to 266.45, 397.99 and 212.18 is: 316.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.45 : 397.99 = 212.18 : x
  2. Step 2: Convert to fraction form
    266.45/397.99 = 212.18/x
  3. Step 3: Cross multiply
    266.45x = 397.99 × 212.18
  4. Step 4: Simplify right side
    266.45x = 84,445.52
  5. Step 5: Solve for x
    x = 84,445.52/266.45
  6. Step 6: Final answer
    x = 316.93

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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.