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Finding the Fourth Proportional to 213.38, 320 and 69.07

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Solution

The fourth proportional to 213.38, 320 and 69.07 is: 103.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.38 : 320 = 69.07 : x
  2. Step 2: Convert to fraction form
    213.38/320 = 69.07/x
  3. Step 3: Cross multiply
    213.38x = 320 × 69.07
  4. Step 4: Simplify right side
    213.38x = 22,100.80
  5. Step 5: Solve for x
    x = 22,100.80/213.38
  6. Step 6: Final answer
    x = 103.57

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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.