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Finding the Fourth Proportional to 217.70, 300.34 and 138.98

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Solution

The fourth proportional to 217.70, 300.34 and 138.98 is: 191.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.70 : 300.34 = 138.98 : x
  2. Step 2: Convert to fraction form
    217.70/300.34 = 138.98/x
  3. Step 3: Cross multiply
    217.70x = 300.34 × 138.98
  4. Step 4: Simplify right side
    217.70x = 41,741.25
  5. Step 5: Solve for x
    x = 41,741.25/217.70
  6. Step 6: Final answer
    x = 191.74

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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.