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Finding the Fourth Proportional to 40, 60.20 and 28.12

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Solution

The fourth proportional to 40, 60.20 and 28.12 is: 42.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    40 : 60.20 = 28.12 : x
  2. Step 2: Convert to fraction form
    40/60.20 = 28.12/x
  3. Step 3: Cross multiply
    40x = 60.20 × 28.12
  4. Step 4: Simplify right side
    40x = 1,692.82
  5. Step 5: Solve for x
    x = 1,692.82/40
  6. Step 6: Final answer
    x = 42.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.