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Finding the Fourth Proportional to 20.03, 30.00 and 12.40

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Solution

The fourth proportional to 20.03, 30.00 and 12.40 is: 18.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.03 : 30.00 = 12.40 : x
  2. Step 2: Convert to fraction form
    20.03/30.00 = 12.40/x
  3. Step 3: Cross multiply
    20.03x = 30.00 × 12.40
  4. Step 4: Simplify right side
    20.03x = 372.07
  5. Step 5: Solve for x
    x = 372.07/20.03
  6. Step 6: Final answer
    x = 18.58

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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.