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Finding the Fourth Proportional to 134.86, 186.05 and 79.58

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Solution

The fourth proportional to 134.86, 186.05 and 79.58 is: 109.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.86 : 186.05 = 79.58 : x
  2. Step 2: Convert to fraction form
    134.86/186.05 = 79.58/x
  3. Step 3: Cross multiply
    134.86x = 186.05 × 79.58
  4. Step 4: Simplify right side
    134.86x = 14,805.46
  5. Step 5: Solve for x
    x = 14,805.46/134.86
  6. Step 6: Final answer
    x = 109.78

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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.