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Finding the Fourth Proportional to 28.52, 39.40 and 25.12

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Solution

The fourth proportional to 28.52, 39.40 and 25.12 is: 34.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.52 : 39.40 = 25.12 : x
  2. Step 2: Convert to fraction form
    28.52/39.40 = 25.12/x
  3. Step 3: Cross multiply
    28.52x = 39.40 × 25.12
  4. Step 4: Simplify right side
    28.52x = 989.73
  5. Step 5: Solve for x
    x = 989.73/28.52
  6. Step 6: Final answer
    x = 34.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.