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Finding the Fourth Proportional to 211.31, 291.40 and 141.45

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Solution

The fourth proportional to 211.31, 291.40 and 141.45 is: 195.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.31 : 291.40 = 141.45 : x
  2. Step 2: Convert to fraction form
    211.31/291.40 = 141.45/x
  3. Step 3: Cross multiply
    211.31x = 291.40 × 141.45
  4. Step 4: Simplify right side
    211.31x = 41,217.08
  5. Step 5: Solve for x
    x = 41,217.08/211.31
  6. Step 6: Final answer
    x = 195.06

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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.