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Finding the Fourth Proportional to 89.63, 134.50 and 54.48

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Solution

The fourth proportional to 89.63, 134.50 and 54.48 is: 81.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.63 : 134.50 = 54.48 : x
  2. Step 2: Convert to fraction form
    89.63/134.50 = 54.48/x
  3. Step 3: Cross multiply
    89.63x = 134.50 × 54.48
  4. Step 4: Simplify right side
    89.63x = 7,327.56
  5. Step 5: Solve for x
    x = 7,327.56/89.63
  6. Step 6: Final answer
    x = 81.75

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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.