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Finding the Fourth Proportional to 30.28, 42.01 and 29.20

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Solution

The fourth proportional to 30.28, 42.01 and 29.20 is: 40.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.28 : 42.01 = 29.20 : x
  2. Step 2: Convert to fraction form
    30.28/42.01 = 29.20/x
  3. Step 3: Cross multiply
    30.28x = 42.01 × 29.20
  4. Step 4: Simplify right side
    30.28x = 1,226.69
  5. Step 5: Solve for x
    x = 1,226.69/30.28
  6. Step 6: Final answer
    x = 40.51

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.