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Finding the Fourth Proportional to 28.42, 42.55 and 19.25

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Solution

The fourth proportional to 28.42, 42.55 and 19.25 is: 28.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.42 : 42.55 = 19.25 : x
  2. Step 2: Convert to fraction form
    28.42/42.55 = 19.25/x
  3. Step 3: Cross multiply
    28.42x = 42.55 × 19.25
  4. Step 4: Simplify right side
    28.42x = 818.99
  5. Step 5: Solve for x
    x = 818.99/28.42
  6. Step 6: Final answer
    x = 28.82

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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.