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Finding the Fourth Proportional to 15.92, 21.96 and 14.78

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Solution

The fourth proportional to 15.92, 21.96 and 14.78 is: 20.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.92 : 21.96 = 14.78 : x
  2. Step 2: Convert to fraction form
    15.92/21.96 = 14.78/x
  3. Step 3: Cross multiply
    15.92x = 21.96 × 14.78
  4. Step 4: Simplify right side
    15.92x = 324.57
  5. Step 5: Solve for x
    x = 324.57/15.92
  6. Step 6: Final answer
    x = 20.39

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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.