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Finding the Fourth Proportional to 211.48, 291.78 and 137.68

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Solution

The fourth proportional to 211.48, 291.78 and 137.68 is: 189.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.48 : 291.78 = 137.68 : x
  2. Step 2: Convert to fraction form
    211.48/291.78 = 137.68/x
  3. Step 3: Cross multiply
    211.48x = 291.78 × 137.68
  4. Step 4: Simplify right side
    211.48x = 40,172.27
  5. Step 5: Solve for x
    x = 40,172.27/211.48
  6. Step 6: Final answer
    x = 189.96

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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.