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Finding the Fourth Proportional to 55.50, 83.28 and 21.29

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Solution

The fourth proportional to 55.50, 83.28 and 21.29 is: 31.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.50 : 83.28 = 21.29 : x
  2. Step 2: Convert to fraction form
    55.50/83.28 = 21.29/x
  3. Step 3: Cross multiply
    55.50x = 83.28 × 21.29
  4. Step 4: Simplify right side
    55.50x = 1,773.03
  5. Step 5: Solve for x
    x = 1,773.03/55.50
  6. Step 6: Final answer
    x = 31.95

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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.