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Finding the Fourth Proportional to 212.42, 293.32 and 138.72

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Solution

The fourth proportional to 212.42, 293.32 and 138.72 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.42 : 293.32 = 138.72 : x
  2. Step 2: Convert to fraction form
    212.42/293.32 = 138.72/x
  3. Step 3: Cross multiply
    212.42x = 293.32 × 138.72
  4. Step 4: Simplify right side
    212.42x = 40,689.35
  5. Step 5: Solve for x
    x = 40,689.35/212.42
  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.