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Finding the Fourth Proportional to 37.85, 56.74 and 19.81

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Solution

The fourth proportional to 37.85, 56.74 and 19.81 is: 29.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.85 : 56.74 = 19.81 : x
  2. Step 2: Convert to fraction form
    37.85/56.74 = 19.81/x
  3. Step 3: Cross multiply
    37.85x = 56.74 × 19.81
  4. Step 4: Simplify right side
    37.85x = 1,124.02
  5. Step 5: Solve for x
    x = 1,124.02/37.85
  6. Step 6: Final answer
    x = 29.70

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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.