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Finding the Fourth Proportional to 85.28, 117.67 and 48.43

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Solution

The fourth proportional to 85.28, 117.67 and 48.43 is: 66.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.28 : 117.67 = 48.43 : x
  2. Step 2: Convert to fraction form
    85.28/117.67 = 48.43/x
  3. Step 3: Cross multiply
    85.28x = 117.67 × 48.43
  4. Step 4: Simplify right side
    85.28x = 5,697.93
  5. Step 5: Solve for x
    x = 5,697.93/85.28
  6. Step 6: Final answer
    x = 66.82

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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.