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Finding the Fourth Proportional to 289.88, 400.12 and 211.24

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Solution

The fourth proportional to 289.88, 400.12 and 211.24 is: 291.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.88 : 400.12 = 211.24 : x
  2. Step 2: Convert to fraction form
    289.88/400.12 = 211.24/x
  3. Step 3: Cross multiply
    289.88x = 400.12 × 211.24
  4. Step 4: Simplify right side
    289.88x = 84,521.35
  5. Step 5: Solve for x
    x = 84,521.35/289.88
  6. Step 6: Final answer
    x = 291.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.