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Finding the Fourth Proportional to 55.89, 83.87 and 19.85

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Solution

The fourth proportional to 55.89, 83.87 and 19.85 is: 29.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.89 : 83.87 = 19.85 : x
  2. Step 2: Convert to fraction form
    55.89/83.87 = 19.85/x
  3. Step 3: Cross multiply
    55.89x = 83.87 × 19.85
  4. Step 4: Simplify right side
    55.89x = 1,664.38
  5. Step 5: Solve for x
    x = 1,664.38/55.89
  6. Step 6: Final answer
    x = 29.78

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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.