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Finding the Fourth Proportional to 65.48, 98.21 and 38.54

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Solution

The fourth proportional to 65.48, 98.21 and 38.54 is: 57.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.48 : 98.21 = 38.54 : x
  2. Step 2: Convert to fraction form
    65.48/98.21 = 38.54/x
  3. Step 3: Cross multiply
    65.48x = 98.21 × 38.54
  4. Step 4: Simplify right side
    65.48x = 3,785.36
  5. Step 5: Solve for x
    x = 3,785.36/65.48
  6. Step 6: Final answer
    x = 57.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.