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Finding the Fourth Proportional to 30.74, 42.39 and 25.48

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Solution

The fourth proportional to 30.74, 42.39 and 25.48 is: 35.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.74 : 42.39 = 25.48 : x
  2. Step 2: Convert to fraction form
    30.74/42.39 = 25.48/x
  3. Step 3: Cross multiply
    30.74x = 42.39 × 25.48
  4. Step 4: Simplify right side
    30.74x = 1,080.10
  5. Step 5: Solve for x
    x = 1,080.10/30.74
  6. Step 6: Final answer
    x = 35.14

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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.