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Finding the Fourth Proportional to 25.93, 38.91 and 18.70

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Solution

The fourth proportional to 25.93, 38.91 and 18.70 is: 28.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.93 : 38.91 = 18.70 : x
  2. Step 2: Convert to fraction form
    25.93/38.91 = 18.70/x
  3. Step 3: Cross multiply
    25.93x = 38.91 × 18.70
  4. Step 4: Simplify right side
    25.93x = 727.62
  5. Step 5: Solve for x
    x = 727.62/25.93
  6. Step 6: Final answer
    x = 28.06

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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.