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Finding the Fourth Proportional to 16.31, 22.50 and 11.45

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Solution

The fourth proportional to 16.31, 22.50 and 11.45 is: 15.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.31 : 22.50 = 11.45 : x
  2. Step 2: Convert to fraction form
    16.31/22.50 = 11.45/x
  3. Step 3: Cross multiply
    16.31x = 22.50 × 11.45
  4. Step 4: Simplify right side
    16.31x = 257.63
  5. Step 5: Solve for x
    x = 257.63/16.31
  6. Step 6: Final answer
    x = 15.80

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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.