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Finding the Fourth Proportional to 212.11, 292.53 and 138.40

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Solution

The fourth proportional to 212.11, 292.53 and 138.40 is: 190.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.11 : 292.53 = 138.40 : x
  2. Step 2: Convert to fraction form
    212.11/292.53 = 138.40/x
  3. Step 3: Cross multiply
    212.11x = 292.53 × 138.40
  4. Step 4: Simplify right side
    212.11x = 40,486.15
  5. Step 5: Solve for x
    x = 40,486.15/212.11
  6. Step 6: Final answer
    x = 190.87

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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.