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Finding the Fourth Proportional to 39.85, 59.65 and 28.37

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Solution

The fourth proportional to 39.85, 59.65 and 28.37 is: 42.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.85 : 59.65 = 28.37 : x
  2. Step 2: Convert to fraction form
    39.85/59.65 = 28.37/x
  3. Step 3: Cross multiply
    39.85x = 59.65 × 28.37
  4. Step 4: Simplify right side
    39.85x = 1,692.27
  5. Step 5: Solve for x
    x = 1,692.27/39.85
  6. Step 6: Final answer
    x = 42.47

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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.