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Finding the Fourth Proportional to 211.56, 291.96 and 123.05

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Solution

The fourth proportional to 211.56, 291.96 and 123.05 is: 169.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.56 : 291.96 = 123.05 : x
  2. Step 2: Convert to fraction form
    211.56/291.96 = 123.05/x
  3. Step 3: Cross multiply
    211.56x = 291.96 × 123.05
  4. Step 4: Simplify right side
    211.56x = 35,924.22
  5. Step 5: Solve for x
    x = 35,924.22/211.56
  6. Step 6: Final answer
    x = 169.81

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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.