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Finding the Fourth Proportional to 37.85, 56.77 and 12.15

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Solution

The fourth proportional to 37.85, 56.77 and 12.15 is: 18.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.85 : 56.77 = 12.15 : x
  2. Step 2: Convert to fraction form
    37.85/56.77 = 12.15/x
  3. Step 3: Cross multiply
    37.85x = 56.77 × 12.15
  4. Step 4: Simplify right side
    37.85x = 689.73
  5. Step 5: Solve for x
    x = 689.73/37.85
  6. Step 6: Final answer
    x = 18.23

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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.