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Finding the Fourth Proportional to 187.76, 258.80 and 135.18

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Solution

The fourth proportional to 187.76, 258.80 and 135.18 is: 186.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.76 : 258.80 = 135.18 : x
  2. Step 2: Convert to fraction form
    187.76/258.80 = 135.18/x
  3. Step 3: Cross multiply
    187.76x = 258.80 × 135.18
  4. Step 4: Simplify right side
    187.76x = 34,983.91
  5. Step 5: Solve for x
    x = 34,983.91/187.76
  6. Step 6: Final answer
    x = 186.33

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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.