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Finding the Fourth Proportional to 55.49, 83.25 and 28.43

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Solution

The fourth proportional to 55.49, 83.25 and 28.43 is: 42.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.49 : 83.25 = 28.43 : x
  2. Step 2: Convert to fraction form
    55.49/83.25 = 28.43/x
  3. Step 3: Cross multiply
    55.49x = 83.25 × 28.43
  4. Step 4: Simplify right side
    55.49x = 2,366.66
  5. Step 5: Solve for x
    x = 2,366.66/55.49
  6. Step 6: Final answer
    x = 42.65

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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.