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Finding the Fourth Proportional to 96.63, 133.29 and 78.21

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Solution

The fourth proportional to 96.63, 133.29 and 78.21 is: 107.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.63 : 133.29 = 78.21 : x
  2. Step 2: Convert to fraction form
    96.63/133.29 = 78.21/x
  3. Step 3: Cross multiply
    96.63x = 133.29 × 78.21
  4. Step 4: Simplify right side
    96.63x = 10,424.61
  5. Step 5: Solve for x
    x = 10,424.61/96.63
  6. Step 6: Final answer
    x = 107.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.