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Finding the Fourth Proportional to 13.28, 20 and 10.64

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Solution

The fourth proportional to 13.28, 20 and 10.64 is: 16.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.28 : 20 = 10.64 : x
  2. Step 2: Convert to fraction form
    13.28/20 = 10.64/x
  3. Step 3: Cross multiply
    13.28x = 20 × 10.64
  4. Step 4: Simplify right side
    13.28x = 212.80
  5. Step 5: Solve for x
    x = 212.80/13.28
  6. Step 6: Final answer
    x = 16.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.