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Finding the Fourth Proportional to 128.74, 193.15 and 60.33

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Solution

The fourth proportional to 128.74, 193.15 and 60.33 is: 90.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.74 : 193.15 = 60.33 : x
  2. Step 2: Convert to fraction form
    128.74/193.15 = 60.33/x
  3. Step 3: Cross multiply
    128.74x = 193.15 × 60.33
  4. Step 4: Simplify right side
    128.74x = 11,652.74
  5. Step 5: Solve for x
    x = 11,652.74/128.74
  6. Step 6: Final answer
    x = 90.51

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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.