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Finding the Fourth Proportional to 30.60, 42.20 and 25.44

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Solution

The fourth proportional to 30.60, 42.20 and 25.44 is: 35.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.60 : 42.20 = 25.44 : x
  2. Step 2: Convert to fraction form
    30.60/42.20 = 25.44/x
  3. Step 3: Cross multiply
    30.60x = 42.20 × 25.44
  4. Step 4: Simplify right side
    30.60x = 1,073.57
  5. Step 5: Solve for x
    x = 1,073.57/30.60
  6. Step 6: Final answer
    x = 35.08

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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.