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Finding the Fourth Proportional to 135.78, 187.62 and 119.58

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Solution

The fourth proportional to 135.78, 187.62 and 119.58 is: 165.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.78 : 187.62 = 119.58 : x
  2. Step 2: Convert to fraction form
    135.78/187.62 = 119.58/x
  3. Step 3: Cross multiply
    135.78x = 187.62 × 119.58
  4. Step 4: Simplify right side
    135.78x = 22,435.60
  5. Step 5: Solve for x
    x = 22,435.60/135.78
  6. Step 6: Final answer
    x = 165.23

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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.