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Finding the Fourth Proportional to 16.64, 24.99 and 12.39

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Solution

The fourth proportional to 16.64, 24.99 and 12.39 is: 18.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.64 : 24.99 = 12.39 : x
  2. Step 2: Convert to fraction form
    16.64/24.99 = 12.39/x
  3. Step 3: Cross multiply
    16.64x = 24.99 × 12.39
  4. Step 4: Simplify right side
    16.64x = 309.63
  5. Step 5: Solve for x
    x = 309.63/16.64
  6. Step 6: Final answer
    x = 18.61

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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.