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Finding the Fourth Proportional to 89.38, 134.09 and 31.60

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Solution

The fourth proportional to 89.38, 134.09 and 31.60 is: 47.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.38 : 134.09 = 31.60 : x
  2. Step 2: Convert to fraction form
    89.38/134.09 = 31.60/x
  3. Step 3: Cross multiply
    89.38x = 134.09 × 31.60
  4. Step 4: Simplify right side
    89.38x = 4,237.12
  5. Step 5: Solve for x
    x = 4,237.12/89.38
  6. Step 6: Final answer
    x = 47.41

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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.