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Finding the Fourth Proportional to 55.48, 83.18 and 28.42

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Solution

The fourth proportional to 55.48, 83.18 and 28.42 is: 42.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.48 : 83.18 = 28.42 : x
  2. Step 2: Convert to fraction form
    55.48/83.18 = 28.42/x
  3. Step 3: Cross multiply
    55.48x = 83.18 × 28.42
  4. Step 4: Simplify right side
    55.48x = 2,363.98
  5. Step 5: Solve for x
    x = 2,363.98/55.48
  6. Step 6: Final answer
    x = 42.61

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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.