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Finding the Fourth Proportional to 211.14, 291.42 and 137.45

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Solution

The fourth proportional to 211.14, 291.42 and 137.45 is: 189.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.14 : 291.42 = 137.45 : x
  2. Step 2: Convert to fraction form
    211.14/291.42 = 137.45/x
  3. Step 3: Cross multiply
    211.14x = 291.42 × 137.45
  4. Step 4: Simplify right side
    211.14x = 40,054.22
  5. Step 5: Solve for x
    x = 40,054.22/211.14
  6. Step 6: Final answer
    x = 189.70

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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.