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Finding the Fourth Proportional to 212.28, 293.08 and 138.74

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Solution

The fourth proportional to 212.28, 293.08 and 138.74 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.28 : 293.08 = 138.74 : x
  2. Step 2: Convert to fraction form
    212.28/293.08 = 138.74/x
  3. Step 3: Cross multiply
    212.28x = 293.08 × 138.74
  4. Step 4: Simplify right side
    212.28x = 40,661.92
  5. Step 5: Solve for x
    x = 40,661.92/212.28
  6. Step 6: Final answer
    x = 191.55

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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.