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Finding the Fourth Proportional to 211.88, 292.20 and 138.18

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Solution

The fourth proportional to 211.88, 292.20 and 138.18 is: 190.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.88 : 292.20 = 138.18 : x
  2. Step 2: Convert to fraction form
    211.88/292.20 = 138.18/x
  3. Step 3: Cross multiply
    211.88x = 292.20 × 138.18
  4. Step 4: Simplify right side
    211.88x = 40,376.20
  5. Step 5: Solve for x
    x = 40,376.20/211.88
  6. Step 6: Final answer
    x = 190.56

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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.