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Finding the Fourth Proportional to 39.77, 59.62 and 20.51

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Solution

The fourth proportional to 39.77, 59.62 and 20.51 is: 30.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.77 : 59.62 = 20.51 : x
  2. Step 2: Convert to fraction form
    39.77/59.62 = 20.51/x
  3. Step 3: Cross multiply
    39.77x = 59.62 × 20.51
  4. Step 4: Simplify right side
    39.77x = 1,222.81
  5. Step 5: Solve for x
    x = 1,222.81/39.77
  6. Step 6: Final answer
    x = 30.75

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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.