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Finding the Fourth Proportional to 20.59, 30.87 and 9.19

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Solution

The fourth proportional to 20.59, 30.87 and 9.19 is: 13.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.59 : 30.87 = 9.19 : x
  2. Step 2: Convert to fraction form
    20.59/30.87 = 9.19/x
  3. Step 3: Cross multiply
    20.59x = 30.87 × 9.19
  4. Step 4: Simplify right side
    20.59x = 283.56
  5. Step 5: Solve for x
    x = 283.56/20.59
  6. Step 6: Final answer
    x = 13.77

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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.