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Finding the Fourth Proportional to 25.42, 38.16 and 19.02

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Solution

The fourth proportional to 25.42, 38.16 and 19.02 is: 28.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.42 : 38.16 = 19.02 : x
  2. Step 2: Convert to fraction form
    25.42/38.16 = 19.02/x
  3. Step 3: Cross multiply
    25.42x = 38.16 × 19.02
  4. Step 4: Simplify right side
    25.42x = 725.80
  5. Step 5: Solve for x
    x = 725.80/25.42
  6. Step 6: Final answer
    x = 28.55

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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.