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Finding the Fourth Proportional to 18.42, 25.43 and 15.21

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Solution

The fourth proportional to 18.42, 25.43 and 15.21 is: 20.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.42 : 25.43 = 15.21 : x
  2. Step 2: Convert to fraction form
    18.42/25.43 = 15.21/x
  3. Step 3: Cross multiply
    18.42x = 25.43 × 15.21
  4. Step 4: Simplify right side
    18.42x = 386.71
  5. Step 5: Solve for x
    x = 386.71/18.42
  6. Step 6: Final answer
    x = 20.99

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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.