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Finding the Fourth Proportional to 213.39, 320.12 and 67.15

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Solution

The fourth proportional to 213.39, 320.12 and 67.15 is: 100.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.39 : 320.12 = 67.15 : x
  2. Step 2: Convert to fraction form
    213.39/320.12 = 67.15/x
  3. Step 3: Cross multiply
    213.39x = 320.12 × 67.15
  4. Step 4: Simplify right side
    213.39x = 21,496.06
  5. Step 5: Solve for x
    x = 21,496.06/213.39
  6. Step 6: Final answer
    x = 100.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.