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Finding the Fourth Proportional to 96.40, 132.72 and 74.56

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Solution

The fourth proportional to 96.40, 132.72 and 74.56 is: 102.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.40 : 132.72 = 74.56 : x
  2. Step 2: Convert to fraction form
    96.40/132.72 = 74.56/x
  3. Step 3: Cross multiply
    96.40x = 132.72 × 74.56
  4. Step 4: Simplify right side
    96.40x = 9,895.60
  5. Step 5: Solve for x
    x = 9,895.60/96.40
  6. Step 6: Final answer
    x = 102.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.