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Finding the Fourth Proportional to 34.90, 52.28 and 28.42

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Solution

The fourth proportional to 34.90, 52.28 and 28.42 is: 42.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.90 : 52.28 = 28.42 : x
  2. Step 2: Convert to fraction form
    34.90/52.28 = 28.42/x
  3. Step 3: Cross multiply
    34.90x = 52.28 × 28.42
  4. Step 4: Simplify right side
    34.90x = 1,485.80
  5. Step 5: Solve for x
    x = 1,485.80/34.90
  6. Step 6: Final answer
    x = 42.57

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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.