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Finding the Fourth Proportional to 134.86, 186.05 and 85.72

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Solution

The fourth proportional to 134.86, 186.05 and 85.72 is: 118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.86 : 186.05 = 85.72 : x
  2. Step 2: Convert to fraction form
    134.86/186.05 = 85.72/x
  3. Step 3: Cross multiply
    134.86x = 186.05 × 85.72
  4. Step 4: Simplify right side
    134.86x = 15,948.21
  5. Step 5: Solve for x
    x = 15,948.21/134.86
  6. Step 6: Final answer
    x = 118.26

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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.