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Finding the Fourth Proportional to 89.10, 133.38 and 71.82

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Solution

The fourth proportional to 89.10, 133.38 and 71.82 is: 107.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.10 : 133.38 = 71.82 : x
  2. Step 2: Convert to fraction form
    89.10/133.38 = 71.82/x
  3. Step 3: Cross multiply
    89.10x = 133.38 × 71.82
  4. Step 4: Simplify right side
    89.10x = 9,579.35
  5. Step 5: Solve for x
    x = 9,579.35/89.10
  6. Step 6: Final answer
    x = 107.51

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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.