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Finding the Fourth Proportional to 211.31, 291.57 and 122.77

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Solution

The fourth proportional to 211.31, 291.57 and 122.77 is: 169.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.31 : 291.57 = 122.77 : x
  2. Step 2: Convert to fraction form
    211.31/291.57 = 122.77/x
  3. Step 3: Cross multiply
    211.31x = 291.57 × 122.77
  4. Step 4: Simplify right side
    211.31x = 35,796.05
  5. Step 5: Solve for x
    x = 35,796.05/211.31
  6. Step 6: Final answer
    x = 169.40

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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.