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Finding the Fourth Proportional to 211.20, 291.57 and 141.36

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Solution

The fourth proportional to 211.20, 291.57 and 141.36 is: 195.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.20 : 291.57 = 141.36 : x
  2. Step 2: Convert to fraction form
    211.20/291.57 = 141.36/x
  3. Step 3: Cross multiply
    211.20x = 291.57 × 141.36
  4. Step 4: Simplify right side
    211.20x = 41,216.34
  5. Step 5: Solve for x
    x = 41,216.34/211.20
  6. Step 6: Final answer
    x = 195.15

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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.