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Finding the Fourth Proportional to 211.71, 291.90 and 141.75

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Solution

The fourth proportional to 211.71, 291.90 and 141.75 is: 195.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.71 : 291.90 = 141.75 : x
  2. Step 2: Convert to fraction form
    211.71/291.90 = 141.75/x
  3. Step 3: Cross multiply
    211.71x = 291.90 × 141.75
  4. Step 4: Simplify right side
    211.71x = 41,377.36
  5. Step 5: Solve for x
    x = 41,377.36/211.71
  6. Step 6: Final answer
    x = 195.44

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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.