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Finding the Fourth Proportional to 45.49, 68.15 and 31.94

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Solution

The fourth proportional to 45.49, 68.15 and 31.94 is: 47.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.49 : 68.15 = 31.94 : x
  2. Step 2: Convert to fraction form
    45.49/68.15 = 31.94/x
  3. Step 3: Cross multiply
    45.49x = 68.15 × 31.94
  4. Step 4: Simplify right side
    45.49x = 2,176.71
  5. Step 5: Solve for x
    x = 2,176.71/45.49
  6. Step 6: Final answer
    x = 47.85

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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.