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Finding the Fourth Proportional to 22.45, 30.91 and 19.39

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Solution

The fourth proportional to 22.45, 30.91 and 19.39 is: 26.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.45 : 30.91 = 19.39 : x
  2. Step 2: Convert to fraction form
    22.45/30.91 = 19.39/x
  3. Step 3: Cross multiply
    22.45x = 30.91 × 19.39
  4. Step 4: Simplify right side
    22.45x = 599.34
  5. Step 5: Solve for x
    x = 599.34/22.45
  6. Step 6: Final answer
    x = 26.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.