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Finding the Fourth Proportional to 211.13, 291.36 and 123.81

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Solution

The fourth proportional to 211.13, 291.36 and 123.81 is: 170.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.13 : 291.36 = 123.81 : x
  2. Step 2: Convert to fraction form
    211.13/291.36 = 123.81/x
  3. Step 3: Cross multiply
    211.13x = 291.36 × 123.81
  4. Step 4: Simplify right side
    211.13x = 36,073.28
  5. Step 5: Solve for x
    x = 36,073.28/211.13
  6. Step 6: Final answer
    x = 170.86

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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.