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Finding the Fourth Proportional to 135.15, 186.44 and 79.89

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Solution

The fourth proportional to 135.15, 186.44 and 79.89 is: 110.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.15 : 186.44 = 79.89 : x
  2. Step 2: Convert to fraction form
    135.15/186.44 = 79.89/x
  3. Step 3: Cross multiply
    135.15x = 186.44 × 79.89
  4. Step 4: Simplify right side
    135.15x = 14,894.69
  5. Step 5: Solve for x
    x = 14,894.69/135.15
  6. Step 6: Final answer
    x = 110.21

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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.