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Finding the Fourth Proportional to 30.75, 45.96 and 25.63

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Solution

The fourth proportional to 30.75, 45.96 and 25.63 is: 38.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.75 : 45.96 = 25.63 : x
  2. Step 2: Convert to fraction form
    30.75/45.96 = 25.63/x
  3. Step 3: Cross multiply
    30.75x = 45.96 × 25.63
  4. Step 4: Simplify right side
    30.75x = 1,177.93
  5. Step 5: Solve for x
    x = 1,177.93/30.75
  6. Step 6: Final answer
    x = 38.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.