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Finding the Fourth Proportional to 28.59, 42.91 and 13.39

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Solution

The fourth proportional to 28.59, 42.91 and 13.39 is: 20.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.59 : 42.91 = 13.39 : x
  2. Step 2: Convert to fraction form
    28.59/42.91 = 13.39/x
  3. Step 3: Cross multiply
    28.59x = 42.91 × 13.39
  4. Step 4: Simplify right side
    28.59x = 574.56
  5. Step 5: Solve for x
    x = 574.56/28.59
  6. Step 6: Final answer
    x = 20.10

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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.