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Finding the Fourth Proportional to 128.92, 193.52 and 99.96

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Solution

The fourth proportional to 128.92, 193.52 and 99.96 is: 150.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.92 : 193.52 = 99.96 : x
  2. Step 2: Convert to fraction form
    128.92/193.52 = 99.96/x
  3. Step 3: Cross multiply
    128.92x = 193.52 × 99.96
  4. Step 4: Simplify right side
    128.92x = 19,344.26
  5. Step 5: Solve for x
    x = 19,344.26/128.92
  6. Step 6: Final answer
    x = 150.05

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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.