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Finding the Fourth Proportional to 22.35, 30.57 and 21.48

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Solution

The fourth proportional to 22.35, 30.57 and 21.48 is: 29.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.35 : 30.57 = 21.48 : x
  2. Step 2: Convert to fraction form
    22.35/30.57 = 21.48/x
  3. Step 3: Cross multiply
    22.35x = 30.57 × 21.48
  4. Step 4: Simplify right side
    22.35x = 656.64
  5. Step 5: Solve for x
    x = 656.64/22.35
  6. Step 6: Final answer
    x = 29.38

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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.