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Finding the Fourth Proportional to 25.42, 38.10 and 13.21

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Solution

The fourth proportional to 25.42, 38.10 and 13.21 is: 19.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.42 : 38.10 = 13.21 : x
  2. Step 2: Convert to fraction form
    25.42/38.10 = 13.21/x
  3. Step 3: Cross multiply
    25.42x = 38.10 × 13.21
  4. Step 4: Simplify right side
    25.42x = 503.30
  5. Step 5: Solve for x
    x = 503.30/25.42
  6. Step 6: Final answer
    x = 19.80

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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.