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Finding the Fourth Proportional to 134.12, 185.06 and 78.86

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Solution

The fourth proportional to 134.12, 185.06 and 78.86 is: 108.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.12 : 185.06 = 78.86 : x
  2. Step 2: Convert to fraction form
    134.12/185.06 = 78.86/x
  3. Step 3: Cross multiply
    134.12x = 185.06 × 78.86
  4. Step 4: Simplify right side
    134.12x = 14,592.51
  5. Step 5: Solve for x
    x = 14,592.51/134.12
  6. Step 6: Final answer
    x = 108.81

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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.