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Finding the Fourth Proportional to 211.55, 291.90 and 118.29

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Solution

The fourth proportional to 211.55, 291.90 and 118.29 is: 163.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.55 : 291.90 = 118.29 : x
  2. Step 2: Convert to fraction form
    211.55/291.90 = 118.29/x
  3. Step 3: Cross multiply
    211.55x = 291.90 × 118.29
  4. Step 4: Simplify right side
    211.55x = 34,528.85
  5. Step 5: Solve for x
    x = 34,528.85/211.55
  6. Step 6: Final answer
    x = 163.22

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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.