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Finding the Fourth Proportional to 18.80, 25.60 and 18.74

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Solution

The fourth proportional to 18.80, 25.60 and 18.74 is: 25.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.80 : 25.60 = 18.74 : x
  2. Step 2: Convert to fraction form
    18.80/25.60 = 18.74/x
  3. Step 3: Cross multiply
    18.80x = 25.60 × 18.74
  4. Step 4: Simplify right side
    18.80x = 479.74
  5. Step 5: Solve for x
    x = 479.74/18.80
  6. Step 6: Final answer
    x = 25.52

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.