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Finding the Fourth Proportional to 85.38, 117.84 and 54.27

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Solution

The fourth proportional to 85.38, 117.84 and 54.27 is: 74.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.38 : 117.84 = 54.27 : x
  2. Step 2: Convert to fraction form
    85.38/117.84 = 54.27/x
  3. Step 3: Cross multiply
    85.38x = 117.84 × 54.27
  4. Step 4: Simplify right side
    85.38x = 6,395.18
  5. Step 5: Solve for x
    x = 6,395.18/85.38
  6. Step 6: Final answer
    x = 74.90

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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.