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Finding the Fourth Proportional to 212.59, 293.21 and 138.93

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Solution

The fourth proportional to 212.59, 293.21 and 138.93 is: 191.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.59 : 293.21 = 138.93 : x
  2. Step 2: Convert to fraction form
    212.59/293.21 = 138.93/x
  3. Step 3: Cross multiply
    212.59x = 293.21 × 138.93
  4. Step 4: Simplify right side
    212.59x = 40,735.67
  5. Step 5: Solve for x
    x = 40,735.67/212.59
  6. Step 6: Final answer
    x = 191.62

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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.