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Finding the Fourth Proportional to 211.72, 291.92 and 138.01

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Solution

The fourth proportional to 211.72, 291.92 and 138.01 is: 190.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.72 : 291.92 = 138.01 : x
  2. Step 2: Convert to fraction form
    211.72/291.92 = 138.01/x
  3. Step 3: Cross multiply
    211.72x = 291.92 × 138.01
  4. Step 4: Simplify right side
    211.72x = 40,287.88
  5. Step 5: Solve for x
    x = 40,287.88/211.72
  6. Step 6: Final answer
    x = 190.29

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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.