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Finding the Fourth Proportional to 211.17, 291.42 and 137.55

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Solution

The fourth proportional to 211.17, 291.42 and 137.55 is: 189.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.17 : 291.42 = 137.55 : x
  2. Step 2: Convert to fraction form
    211.17/291.42 = 137.55/x
  3. Step 3: Cross multiply
    211.17x = 291.42 × 137.55
  4. Step 4: Simplify right side
    211.17x = 40,084.82
  5. Step 5: Solve for x
    x = 40,084.82/211.17
  6. Step 6: Final answer
    x = 189.82

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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.