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Finding the Fourth Proportional to 211.34, 291.44 and 136.55

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Solution

The fourth proportional to 211.34, 291.44 and 136.55 is: 188.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.34 : 291.44 = 136.55 : x
  2. Step 2: Convert to fraction form
    211.34/291.44 = 136.55/x
  3. Step 3: Cross multiply
    211.34x = 291.44 × 136.55
  4. Step 4: Simplify right side
    211.34x = 39,797.20
  5. Step 5: Solve for x
    x = 39,797.20/211.34
  6. Step 6: Final answer
    x = 188.31

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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.