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Finding the Fourth Proportional to 213.93, 320.68 and 76.89

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Solution

The fourth proportional to 213.93, 320.68 and 76.89 is: 115.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.93 : 320.68 = 76.89 : x
  2. Step 2: Convert to fraction form
    213.93/320.68 = 76.89/x
  3. Step 3: Cross multiply
    213.93x = 320.68 × 76.89
  4. Step 4: Simplify right side
    213.93x = 24,658.38
  5. Step 5: Solve for x
    x = 24,658.38/213.93
  6. Step 6: Final answer
    x = 115.26

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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.