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Finding the Fourth Proportional to 135.18, 186.48 and 79.86

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Solution

The fourth proportional to 135.18, 186.48 and 79.86 is: 110.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.18 : 186.48 = 79.86 : x
  2. Step 2: Convert to fraction form
    135.18/186.48 = 79.86/x
  3. Step 3: Cross multiply
    135.18x = 186.48 × 79.86
  4. Step 4: Simplify right side
    135.18x = 14,892.29
  5. Step 5: Solve for x
    x = 14,892.29/135.18
  6. Step 6: Final answer
    x = 110.17

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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.