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Finding the Fourth Proportional to 213.61, 320.33 and 76.63

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Solution

The fourth proportional to 213.61, 320.33 and 76.63 is: 114.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.61 : 320.33 = 76.63 : x
  2. Step 2: Convert to fraction form
    213.61/320.33 = 76.63/x
  3. Step 3: Cross multiply
    213.61x = 320.33 × 76.63
  4. Step 4: Simplify right side
    213.61x = 24,546.28
  5. Step 5: Solve for x
    x = 24,546.28/213.61
  6. Step 6: Final answer
    x = 114.91

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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.