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Finding the Fourth Proportional to 20.73, 28.58 and 15.28

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Solution

The fourth proportional to 20.73, 28.58 and 15.28 is: 21.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.73 : 28.58 = 15.28 : x
  2. Step 2: Convert to fraction form
    20.73/28.58 = 15.28/x
  3. Step 3: Cross multiply
    20.73x = 28.58 × 15.28
  4. Step 4: Simplify right side
    20.73x = 436.74
  5. Step 5: Solve for x
    x = 436.74/20.73
  6. Step 6: Final answer
    x = 21.07

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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.