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Finding the Fourth Proportional to 135.18, 186.50 and 86.09

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Solution

The fourth proportional to 135.18, 186.50 and 86.09 is: 118.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.18 : 186.50 = 86.09 : x
  2. Step 2: Convert to fraction form
    135.18/186.50 = 86.09/x
  3. Step 3: Cross multiply
    135.18x = 186.50 × 86.09
  4. Step 4: Simplify right side
    135.18x = 16,055.07
  5. Step 5: Solve for x
    x = 16,055.07/135.18
  6. Step 6: Final answer
    x = 118.77

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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.