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Finding the Fourth Proportional to 96.84, 145.28 and 31.82

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Solution

The fourth proportional to 96.84, 145.28 and 31.82 is: 47.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.84 : 145.28 = 31.82 : x
  2. Step 2: Convert to fraction form
    96.84/145.28 = 31.82/x
  3. Step 3: Cross multiply
    96.84x = 145.28 × 31.82
  4. Step 4: Simplify right side
    96.84x = 4,622.81
  5. Step 5: Solve for x
    x = 4,622.81/96.84
  6. Step 6: Final answer
    x = 47.74

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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.