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Finding the Fourth Proportional to 38.17, 57.21 and 21.01

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Solution

The fourth proportional to 38.17, 57.21 and 21.01 is: 31.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.17 : 57.21 = 21.01 : x
  2. Step 2: Convert to fraction form
    38.17/57.21 = 21.01/x
  3. Step 3: Cross multiply
    38.17x = 57.21 × 21.01
  4. Step 4: Simplify right side
    38.17x = 1,201.87
  5. Step 5: Solve for x
    x = 1,201.87/38.17
  6. Step 6: Final answer
    x = 31.49

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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.