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Finding the Fourth Proportional to 23.09, 31.88 and 21.27

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Solution

The fourth proportional to 23.09, 31.88 and 21.27 is: 29.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.09 : 31.88 = 21.27 : x
  2. Step 2: Convert to fraction form
    23.09/31.88 = 21.27/x
  3. Step 3: Cross multiply
    23.09x = 31.88 × 21.27
  4. Step 4: Simplify right side
    23.09x = 678.09
  5. Step 5: Solve for x
    x = 678.09/23.09
  6. Step 6: Final answer
    x = 29.37

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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.