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Finding the Fourth Proportional to 30.95, 42.75 and 25.12

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Solution

The fourth proportional to 30.95, 42.75 and 25.12 is: 34.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.95 : 42.75 = 25.12 : x
  2. Step 2: Convert to fraction form
    30.95/42.75 = 25.12/x
  3. Step 3: Cross multiply
    30.95x = 42.75 × 25.12
  4. Step 4: Simplify right side
    30.95x = 1,073.67
  5. Step 5: Solve for x
    x = 1,073.67/30.95
  6. Step 6: Final answer
    x = 34.69

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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.