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Finding the Fourth Proportional to 21.31, 31.73 and 21.04

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Solution

The fourth proportional to 21.31, 31.73 and 21.04 is: 31.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.31 : 31.73 = 21.04 : x
  2. Step 2: Convert to fraction form
    21.31/31.73 = 21.04/x
  3. Step 3: Cross multiply
    21.31x = 31.73 × 21.04
  4. Step 4: Simplify right side
    21.31x = 667.57
  5. Step 5: Solve for x
    x = 667.57/21.31
  6. Step 6: Final answer
    x = 31.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.