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Finding the Fourth Proportional to 96.16, 132.72 and 74.40

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Solution

The fourth proportional to 96.16, 132.72 and 74.40 is: 102.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.16 : 132.72 = 74.40 : x
  2. Step 2: Convert to fraction form
    96.16/132.72 = 74.40/x
  3. Step 3: Cross multiply
    96.16x = 132.72 × 74.40
  4. Step 4: Simplify right side
    96.16x = 9,874.37
  5. Step 5: Solve for x
    x = 9,874.37/96.16
  6. Step 6: Final answer
    x = 102.69

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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.