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Finding the Fourth Proportional to 28.87, 43.20 and 18.70

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Solution

The fourth proportional to 28.87, 43.20 and 18.70 is: 27.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.87 : 43.20 = 18.70 : x
  2. Step 2: Convert to fraction form
    28.87/43.20 = 18.70/x
  3. Step 3: Cross multiply
    28.87x = 43.20 × 18.70
  4. Step 4: Simplify right side
    28.87x = 807.73
  5. Step 5: Solve for x
    x = 807.73/28.87
  6. Step 6: Final answer
    x = 27.98

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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.