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Finding the Fourth Proportional to 45.82, 68.70 and 18.75

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Solution

The fourth proportional to 45.82, 68.70 and 18.75 is: 28.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.82 : 68.70 = 18.75 : x
  2. Step 2: Convert to fraction form
    45.82/68.70 = 18.75/x
  3. Step 3: Cross multiply
    45.82x = 68.70 × 18.75
  4. Step 4: Simplify right side
    45.82x = 1,288.13
  5. Step 5: Solve for x
    x = 1,288.13/45.82
  6. Step 6: Final answer
    x = 28.11

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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.