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Finding the Fourth Proportional to 15.82, 21.90 and 15.52

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Solution

The fourth proportional to 15.82, 21.90 and 15.52 is: 21.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.82 : 21.90 = 15.52 : x
  2. Step 2: Convert to fraction form
    15.82/21.90 = 15.52/x
  3. Step 3: Cross multiply
    15.82x = 21.90 × 15.52
  4. Step 4: Simplify right side
    15.82x = 339.89
  5. Step 5: Solve for x
    x = 339.89/15.82
  6. Step 6: Final answer
    x = 21.48

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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.