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Finding the Fourth Proportional to 211.32, 291.42 and 137.70

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Solution

The fourth proportional to 211.32, 291.42 and 137.70 is: 189.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.32 : 291.42 = 137.70 : x
  2. Step 2: Convert to fraction form
    211.32/291.42 = 137.70/x
  3. Step 3: Cross multiply
    211.32x = 291.42 × 137.70
  4. Step 4: Simplify right side
    211.32x = 40,128.53
  5. Step 5: Solve for x
    x = 40,128.53/211.32
  6. Step 6: Final answer
    x = 189.89

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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.