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Finding the Fourth Proportional to 55.56, 83.31 and 21.33

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Solution

The fourth proportional to 55.56, 83.31 and 21.33 is: 31.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.56 : 83.31 = 21.33 : x
  2. Step 2: Convert to fraction form
    55.56/83.31 = 21.33/x
  3. Step 3: Cross multiply
    55.56x = 83.31 × 21.33
  4. Step 4: Simplify right side
    55.56x = 1,777.00
  5. Step 5: Solve for x
    x = 1,777.00/55.56
  6. Step 6: Final answer
    x = 31.98

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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.