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Finding the Fourth Proportional to 187.28, 258.36 and 135.44

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Solution

The fourth proportional to 187.28, 258.36 and 135.44 is: 186.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.28 : 258.36 = 135.44 : x
  2. Step 2: Convert to fraction form
    187.28/258.36 = 135.44/x
  3. Step 3: Cross multiply
    187.28x = 258.36 × 135.44
  4. Step 4: Simplify right side
    187.28x = 34,992.28
  5. Step 5: Solve for x
    x = 34,992.28/187.28
  6. Step 6: Final answer
    x = 186.84

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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.