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Finding the Fourth Proportional to 211.05, 291.29 and 122.54

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Solution

The fourth proportional to 211.05, 291.29 and 122.54 is: 169.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.05 : 291.29 = 122.54 : x
  2. Step 2: Convert to fraction form
    211.05/291.29 = 122.54/x
  3. Step 3: Cross multiply
    211.05x = 291.29 × 122.54
  4. Step 4: Simplify right side
    211.05x = 35,694.68
  5. Step 5: Solve for x
    x = 35,694.68/211.05
  6. Step 6: Final answer
    x = 169.13

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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.