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Finding the Fourth Proportional to 45.91, 68.91 and 38.35

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Solution

The fourth proportional to 45.91, 68.91 and 38.35 is: 57.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.91 : 68.91 = 38.35 : x
  2. Step 2: Convert to fraction form
    45.91/68.91 = 38.35/x
  3. Step 3: Cross multiply
    45.91x = 68.91 × 38.35
  4. Step 4: Simplify right side
    45.91x = 2,642.70
  5. Step 5: Solve for x
    x = 2,642.70/45.91
  6. Step 6: Final answer
    x = 57.56

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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.