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Finding the Fourth Proportional to 20.66, 28.51 and 12.37

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Solution

The fourth proportional to 20.66, 28.51 and 12.37 is: 17.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.66 : 28.51 = 12.37 : x
  2. Step 2: Convert to fraction form
    20.66/28.51 = 12.37/x
  3. Step 3: Cross multiply
    20.66x = 28.51 × 12.37
  4. Step 4: Simplify right side
    20.66x = 352.51
  5. Step 5: Solve for x
    x = 352.51/20.66
  6. Step 6: Final answer
    x = 17.06

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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.