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Finding the Fourth Proportional to 211.56, 291.94 and 118.31

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Solution

The fourth proportional to 211.56, 291.94 and 118.31 is: 163.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.56 : 291.94 = 118.31 : x
  2. Step 2: Convert to fraction form
    211.56/291.94 = 118.31/x
  3. Step 3: Cross multiply
    211.56x = 291.94 × 118.31
  4. Step 4: Simplify right side
    211.56x = 34,537.37
  5. Step 5: Solve for x
    x = 34,537.37/211.56
  6. Step 6: Final answer
    x = 163.25

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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.