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Finding the Fourth Proportional to 39.68, 54.72 and 28.77

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Solution

The fourth proportional to 39.68, 54.72 and 28.77 is: 39.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.68 : 54.72 = 28.77 : x
  2. Step 2: Convert to fraction form
    39.68/54.72 = 28.77/x
  3. Step 3: Cross multiply
    39.68x = 54.72 × 28.77
  4. Step 4: Simplify right side
    39.68x = 1,574.29
  5. Step 5: Solve for x
    x = 1,574.29/39.68
  6. Step 6: Final answer
    x = 39.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.