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Finding the Fourth Proportional to 37.49, 56.21 and 20.15

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Solution

The fourth proportional to 37.49, 56.21 and 20.15 is: 30.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.49 : 56.21 = 20.15 : x
  2. Step 2: Convert to fraction form
    37.49/56.21 = 20.15/x
  3. Step 3: Cross multiply
    37.49x = 56.21 × 20.15
  4. Step 4: Simplify right side
    37.49x = 1,132.63
  5. Step 5: Solve for x
    x = 1,132.63/37.49
  6. Step 6: Final answer
    x = 30.21

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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.