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Finding the Fourth Proportional to 25.20, 34.70 and 17.42

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Solution

The fourth proportional to 25.20, 34.70 and 17.42 is: 23.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.20 : 34.70 = 17.42 : x
  2. Step 2: Convert to fraction form
    25.20/34.70 = 17.42/x
  3. Step 3: Cross multiply
    25.20x = 34.70 × 17.42
  4. Step 4: Simplify right side
    25.20x = 604.47
  5. Step 5: Solve for x
    x = 604.47/25.20
  6. Step 6: Final answer
    x = 23.99

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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.