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Finding the Fourth Proportional to 96.51, 133.05 and 81.70

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Solution

The fourth proportional to 96.51, 133.05 and 81.70 is: 112.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.51 : 133.05 = 81.70 : x
  2. Step 2: Convert to fraction form
    96.51/133.05 = 81.70/x
  3. Step 3: Cross multiply
    96.51x = 133.05 × 81.70
  4. Step 4: Simplify right side
    96.51x = 10,869.70
  5. Step 5: Solve for x
    x = 10,869.70/96.51
  6. Step 6: Final answer
    x = 112.63

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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.