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Finding the Fourth Proportional to 89.40, 134.01 and 28.49

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Solution

The fourth proportional to 89.40, 134.01 and 28.49 is: 42.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.40 : 134.01 = 28.49 : x
  2. Step 2: Convert to fraction form
    89.40/134.01 = 28.49/x
  3. Step 3: Cross multiply
    89.40x = 134.01 × 28.49
  4. Step 4: Simplify right side
    89.40x = 3,817.39
  5. Step 5: Solve for x
    x = 3,817.39/89.40
  6. Step 6: Final answer
    x = 42.70

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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.