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Finding the Fourth Proportional to 39.72, 59.61 and 28.40

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Solution

The fourth proportional to 39.72, 59.61 and 28.40 is: 42.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.72 : 59.61 = 28.40 : x
  2. Step 2: Convert to fraction form
    39.72/59.61 = 28.40/x
  3. Step 3: Cross multiply
    39.72x = 59.61 × 28.40
  4. Step 4: Simplify right side
    39.72x = 1,692.63
  5. Step 5: Solve for x
    x = 1,692.63/39.72
  6. Step 6: Final answer
    x = 42.61

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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.