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Finding the Fourth Proportional to 89.46, 134.21 and 31.67

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Solution

The fourth proportional to 89.46, 134.21 and 31.67 is: 47.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.46 : 134.21 = 31.67 : x
  2. Step 2: Convert to fraction form
    89.46/134.21 = 31.67/x
  3. Step 3: Cross multiply
    89.46x = 134.21 × 31.67
  4. Step 4: Simplify right side
    89.46x = 4,250.43
  5. Step 5: Solve for x
    x = 4,250.43/89.46
  6. Step 6: Final answer
    x = 47.51

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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.