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Finding the Fourth Proportional to 39.76, 59.62 and 20.50

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Solution

The fourth proportional to 39.76, 59.62 and 20.50 is: 30.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.76 : 59.62 = 20.50 : x
  2. Step 2: Convert to fraction form
    39.76/59.62 = 20.50/x
  3. Step 3: Cross multiply
    39.76x = 59.62 × 20.50
  4. Step 4: Simplify right side
    39.76x = 1,222.21
  5. Step 5: Solve for x
    x = 1,222.21/39.76
  6. Step 6: Final answer
    x = 30.74

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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.