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Finding the Fourth Proportional to 85.28, 117.69 and 48.44

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Solution

The fourth proportional to 85.28, 117.69 and 48.44 is: 66.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.28 : 117.69 = 48.44 : x
  2. Step 2: Convert to fraction form
    85.28/117.69 = 48.44/x
  3. Step 3: Cross multiply
    85.28x = 117.69 × 48.44
  4. Step 4: Simplify right side
    85.28x = 5,700.90
  5. Step 5: Solve for x
    x = 5,700.90/85.28
  6. Step 6: Final answer
    x = 66.85

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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.