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Finding the Fourth Proportional to 30.38, 45.59 and 16.85

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Solution

The fourth proportional to 30.38, 45.59 and 16.85 is: 25.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.38 : 45.59 = 16.85 : x
  2. Step 2: Convert to fraction form
    30.38/45.59 = 16.85/x
  3. Step 3: Cross multiply
    30.38x = 45.59 × 16.85
  4. Step 4: Simplify right side
    30.38x = 767.88
  5. Step 5: Solve for x
    x = 767.88/30.38
  6. Step 6: Final answer
    x = 25.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.