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Finding the Fourth Proportional to 20.47, 28.10 and 19.93

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Solution

The fourth proportional to 20.47, 28.10 and 19.93 is: 27.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.47 : 28.10 = 19.93 : x
  2. Step 2: Convert to fraction form
    20.47/28.10 = 19.93/x
  3. Step 3: Cross multiply
    20.47x = 28.10 × 19.93
  4. Step 4: Simplify right side
    20.47x = 560.03
  5. Step 5: Solve for x
    x = 560.03/20.47
  6. Step 6: Final answer
    x = 27.36

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.