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Finding the Fourth Proportional to 213.59, 320.38 and 74.75

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Solution

The fourth proportional to 213.59, 320.38 and 74.75 is: 112.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.59 : 320.38 = 74.75 : x
  2. Step 2: Convert to fraction form
    213.59/320.38 = 74.75/x
  3. Step 3: Cross multiply
    213.59x = 320.38 × 74.75
  4. Step 4: Simplify right side
    213.59x = 23,947.73
  5. Step 5: Solve for x
    x = 23,947.73/213.59
  6. Step 6: Final answer
    x = 112.12

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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.