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Finding the Fourth Proportional to 213.62, 320.36 and 76.64

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Solution

The fourth proportional to 213.62, 320.36 and 76.64 is: 114.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.62 : 320.36 = 76.64 : x
  2. Step 2: Convert to fraction form
    213.62/320.36 = 76.64/x
  3. Step 3: Cross multiply
    213.62x = 320.36 × 76.64
  4. Step 4: Simplify right side
    213.62x = 24,552.39
  5. Step 5: Solve for x
    x = 24,552.39/213.62
  6. Step 6: Final answer
    x = 114.93

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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.