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Finding the Fourth Proportional to 89.64, 134.45 and 31.91

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Solution

The fourth proportional to 89.64, 134.45 and 31.91 is: 47.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.64 : 134.45 = 31.91 : x
  2. Step 2: Convert to fraction form
    89.64/134.45 = 31.91/x
  3. Step 3: Cross multiply
    89.64x = 134.45 × 31.91
  4. Step 4: Simplify right side
    89.64x = 4,289.47
  5. Step 5: Solve for x
    x = 4,289.47/89.64
  6. Step 6: Final answer
    x = 47.85

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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.