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Finding the Fourth Proportional to 128.03, 176.45 and 96.87

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Solution

The fourth proportional to 128.03, 176.45 and 96.87 is: 133.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.03 : 176.45 = 96.87 : x
  2. Step 2: Convert to fraction form
    128.03/176.45 = 96.87/x
  3. Step 3: Cross multiply
    128.03x = 176.45 × 96.87
  4. Step 4: Simplify right side
    128.03x = 17,093.21
  5. Step 5: Solve for x
    x = 17,093.21/128.03
  6. Step 6: Final answer
    x = 133.51

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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.