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Finding the Fourth Proportional to 213.67, 320.42 and 76.69

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Solution

The fourth proportional to 213.67, 320.42 and 76.69 is: 115.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.67 : 320.42 = 76.69 : x
  2. Step 2: Convert to fraction form
    213.67/320.42 = 76.69/x
  3. Step 3: Cross multiply
    213.67x = 320.42 × 76.69
  4. Step 4: Simplify right side
    213.67x = 24,573.01
  5. Step 5: Solve for x
    x = 24,573.01/213.67
  6. Step 6: Final answer
    x = 115.00

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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.