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Finding the Fourth Proportional to 89.40, 134.09 and 38.05

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Solution

The fourth proportional to 89.40, 134.09 and 38.05 is: 57.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.40 : 134.09 = 38.05 : x
  2. Step 2: Convert to fraction form
    89.40/134.09 = 38.05/x
  3. Step 3: Cross multiply
    89.40x = 134.09 × 38.05
  4. Step 4: Simplify right side
    89.40x = 5,102.12
  5. Step 5: Solve for x
    x = 5,102.12/89.40
  6. Step 6: Final answer
    x = 57.07

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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.