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Finding the Fourth Proportional to 15.92, 22 and 12.72

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Solution

The fourth proportional to 15.92, 22 and 12.72 is: 17.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.92 : 22 = 12.72 : x
  2. Step 2: Convert to fraction form
    15.92/22 = 12.72/x
  3. Step 3: Cross multiply
    15.92x = 22 × 12.72
  4. Step 4: Simplify right side
    15.92x = 279.84
  5. Step 5: Solve for x
    x = 279.84/15.92
  6. Step 6: Final answer
    x = 17.58

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1.5x scale

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.