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Finding the Fourth Proportional to 20.60, 30.91 and 9.03

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Solution

The fourth proportional to 20.60, 30.91 and 9.03 is: 13.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.60 : 30.91 = 9.03 : x
  2. Step 2: Convert to fraction form
    20.60/30.91 = 9.03/x
  3. Step 3: Cross multiply
    20.60x = 30.91 × 9.03
  4. Step 4: Simplify right side
    20.60x = 279.16
  5. Step 5: Solve for x
    x = 279.16/20.60
  6. Step 6: Final answer
    x = 13.55

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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.