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Finding the Fourth Proportional to 18.21, 25.10 and 14.32

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Solution

The fourth proportional to 18.21, 25.10 and 14.32 is: 19.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.21 : 25.10 = 14.32 : x
  2. Step 2: Convert to fraction form
    18.21/25.10 = 14.32/x
  3. Step 3: Cross multiply
    18.21x = 25.10 × 14.32
  4. Step 4: Simplify right side
    18.21x = 359.43
  5. Step 5: Solve for x
    x = 359.43/18.21
  6. Step 6: Final answer
    x = 19.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.