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Finding the Fourth Proportional to 21.36, 29.31 and 20.48

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Solution

The fourth proportional to 21.36, 29.31 and 20.48 is: 28.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.36 : 29.31 = 20.48 : x
  2. Step 2: Convert to fraction form
    21.36/29.31 = 20.48/x
  3. Step 3: Cross multiply
    21.36x = 29.31 × 20.48
  4. Step 4: Simplify right side
    21.36x = 600.12
  5. Step 5: Solve for x
    x = 600.12/21.36
  6. Step 6: Final answer
    x = 28.10

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.