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Finding the Fourth Proportional to 55.32, 76.40 and 38.96

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Solution

The fourth proportional to 55.32, 76.40 and 38.96 is: 53.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.32 : 76.40 = 38.96 : x
  2. Step 2: Convert to fraction form
    55.32/76.40 = 38.96/x
  3. Step 3: Cross multiply
    55.32x = 76.40 × 38.96
  4. Step 4: Simplify right side
    55.32x = 2,976.54
  5. Step 5: Solve for x
    x = 2,976.54/55.32
  6. Step 6: Final answer
    x = 53.81

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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.