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Finding the Fourth Proportional to 55.53, 83.27 and 21.27

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Solution

The fourth proportional to 55.53, 83.27 and 21.27 is: 31.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.53 : 83.27 = 21.27 : x
  2. Step 2: Convert to fraction form
    55.53/83.27 = 21.27/x
  3. Step 3: Cross multiply
    55.53x = 83.27 × 21.27
  4. Step 4: Simplify right side
    55.53x = 1,771.15
  5. Step 5: Solve for x
    x = 1,771.15/55.53
  6. Step 6: Final answer
    x = 31.90

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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.