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Finding the Fourth Proportional to 211.18, 291.14 and 137.37

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Solution

The fourth proportional to 211.18, 291.14 and 137.37 is: 189.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.18 : 291.14 = 137.37 : x
  2. Step 2: Convert to fraction form
    211.18/291.14 = 137.37/x
  3. Step 3: Cross multiply
    211.18x = 291.14 × 137.37
  4. Step 4: Simplify right side
    211.18x = 39,994.78
  5. Step 5: Solve for x
    x = 39,994.78/211.18
  6. Step 6: Final answer
    x = 189.39

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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.