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Finding the Fourth Proportional to 20.48, 30.52 and 20.31

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Solution

The fourth proportional to 20.48, 30.52 and 20.31 is: 30.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.48 : 30.52 = 20.31 : x
  2. Step 2: Convert to fraction form
    20.48/30.52 = 20.31/x
  3. Step 3: Cross multiply
    20.48x = 30.52 × 20.31
  4. Step 4: Simplify right side
    20.48x = 619.86
  5. Step 5: Solve for x
    x = 619.86/20.48
  6. Step 6: Final answer
    x = 30.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.