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Finding the Fourth Proportional to 128.52, 193.14 and 105.48

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Solution

The fourth proportional to 128.52, 193.14 and 105.48 is: 158.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.52 : 193.14 = 105.48 : x
  2. Step 2: Convert to fraction form
    128.52/193.14 = 105.48/x
  3. Step 3: Cross multiply
    128.52x = 193.14 × 105.48
  4. Step 4: Simplify right side
    128.52x = 20,372.41
  5. Step 5: Solve for x
    x = 20,372.41/128.52
  6. Step 6: Final answer
    x = 158.52

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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.