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Finding the Fourth Proportional to 13.63, 20.40 and 12.58

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Solution

The fourth proportional to 13.63, 20.40 and 12.58 is: 18.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.63 : 20.40 = 12.58 : x
  2. Step 2: Convert to fraction form
    13.63/20.40 = 12.58/x
  3. Step 3: Cross multiply
    13.63x = 20.40 × 12.58
  4. Step 4: Simplify right side
    13.63x = 256.63
  5. Step 5: Solve for x
    x = 256.63/13.63
  6. Step 6: Final answer
    x = 18.83

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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.