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Finding the Fourth Proportional to 134.40, 185.57 and 85.38

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Solution

The fourth proportional to 134.40, 185.57 and 85.38 is: 117.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.40 : 185.57 = 85.38 : x
  2. Step 2: Convert to fraction form
    134.40/185.57 = 85.38/x
  3. Step 3: Cross multiply
    134.40x = 185.57 × 85.38
  4. Step 4: Simplify right side
    134.40x = 15,843.97
  5. Step 5: Solve for x
    x = 15,843.97/134.40
  6. Step 6: Final answer
    x = 117.89

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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.