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Finding the Fourth Proportional to 31.31, 46.98 and 19.27

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Solution

The fourth proportional to 31.31, 46.98 and 19.27 is: 28.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.31 : 46.98 = 19.27 : x
  2. Step 2: Convert to fraction form
    31.31/46.98 = 19.27/x
  3. Step 3: Cross multiply
    31.31x = 46.98 × 19.27
  4. Step 4: Simplify right side
    31.31x = 905.10
  5. Step 5: Solve for x
    x = 905.10/31.31
  6. Step 6: Final answer
    x = 28.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.