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Finding the Fourth Proportional to 211.21, 291.61 and 136.66

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Solution

The fourth proportional to 211.21, 291.61 and 136.66 is: 188.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.21 : 291.61 = 136.66 : x
  2. Step 2: Convert to fraction form
    211.21/291.61 = 136.66/x
  3. Step 3: Cross multiply
    211.21x = 291.61 × 136.66
  4. Step 4: Simplify right side
    211.21x = 39,851.42
  5. Step 5: Solve for x
    x = 39,851.42/211.21
  6. Step 6: Final answer
    x = 188.68

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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.