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Finding the Fourth Proportional to 186.91, 258.20 and 135.43

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Solution

The fourth proportional to 186.91, 258.20 and 135.43 is: 187.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.91 : 258.20 = 135.43 : x
  2. Step 2: Convert to fraction form
    186.91/258.20 = 135.43/x
  3. Step 3: Cross multiply
    186.91x = 258.20 × 135.43
  4. Step 4: Simplify right side
    186.91x = 34,968.03
  5. Step 5: Solve for x
    x = 34,968.03/186.91
  6. Step 6: Final answer
    x = 187.08

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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.