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Finding the Fourth Proportional to 22.38, 30.68 and 22.16

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Solution

The fourth proportional to 22.38, 30.68 and 22.16 is: 30.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.38 : 30.68 = 22.16 : x
  2. Step 2: Convert to fraction form
    22.38/30.68 = 22.16/x
  3. Step 3: Cross multiply
    22.38x = 30.68 × 22.16
  4. Step 4: Simplify right side
    22.38x = 679.87
  5. Step 5: Solve for x
    x = 679.87/22.38
  6. Step 6: Final answer
    x = 30.38

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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.