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Finding the Fourth Proportional to 23.01, 31.68 and 20.40

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Solution

The fourth proportional to 23.01, 31.68 and 20.40 is: 28.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.01 : 31.68 = 20.40 : x
  2. Step 2: Convert to fraction form
    23.01/31.68 = 20.40/x
  3. Step 3: Cross multiply
    23.01x = 31.68 × 20.40
  4. Step 4: Simplify right side
    23.01x = 646.27
  5. Step 5: Solve for x
    x = 646.27/23.01
  6. Step 6: Final answer
    x = 28.09

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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.