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Finding the Fourth Proportional to 55.75, 83.56 and 28.72

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Solution

The fourth proportional to 55.75, 83.56 and 28.72 is: 43.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.75 : 83.56 = 28.72 : x
  2. Step 2: Convert to fraction form
    55.75/83.56 = 28.72/x
  3. Step 3: Cross multiply
    55.75x = 83.56 × 28.72
  4. Step 4: Simplify right side
    55.75x = 2,399.84
  5. Step 5: Solve for x
    x = 2,399.84/55.75
  6. Step 6: Final answer
    x = 43.05

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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.