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Finding the Fourth Proportional to 30.02, 41.36 and 20.30

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Solution

The fourth proportional to 30.02, 41.36 and 20.30 is: 27.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.02 : 41.36 = 20.30 : x
  2. Step 2: Convert to fraction form
    30.02/41.36 = 20.30/x
  3. Step 3: Cross multiply
    30.02x = 41.36 × 20.30
  4. Step 4: Simplify right side
    30.02x = 839.61
  5. Step 5: Solve for x
    x = 839.61/30.02
  6. Step 6: Final answer
    x = 27.97

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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.