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Finding the Fourth Proportional to 38.74, 58.07 and 20.67

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Solution

The fourth proportional to 38.74, 58.07 and 20.67 is: 30.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.74 : 58.07 = 20.67 : x
  2. Step 2: Convert to fraction form
    38.74/58.07 = 20.67/x
  3. Step 3: Cross multiply
    38.74x = 58.07 × 20.67
  4. Step 4: Simplify right side
    38.74x = 1,200.31
  5. Step 5: Solve for x
    x = 1,200.31/38.74
  6. Step 6: Final answer
    x = 30.98

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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.