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Finding the Fourth Proportional to 28.48, 42.50 and 28.21

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Solution

The fourth proportional to 28.48, 42.50 and 28.21 is: 42.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.48 : 42.50 = 28.21 : x
  2. Step 2: Convert to fraction form
    28.48/42.50 = 28.21/x
  3. Step 3: Cross multiply
    28.48x = 42.50 × 28.21
  4. Step 4: Simplify right side
    28.48x = 1,198.93
  5. Step 5: Solve for x
    x = 1,198.93/28.48
  6. Step 6: Final answer
    x = 42.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.