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Finding the Fourth Proportional to 128.89, 193.34 and 60.39

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Solution

The fourth proportional to 128.89, 193.34 and 60.39 is: 90.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.89 : 193.34 = 60.39 : x
  2. Step 2: Convert to fraction form
    128.89/193.34 = 60.39/x
  3. Step 3: Cross multiply
    128.89x = 193.34 × 60.39
  4. Step 4: Simplify right side
    128.89x = 11,675.50
  5. Step 5: Solve for x
    x = 11,675.50/128.89
  6. Step 6: Final answer
    x = 90.59

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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.