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Finding the Fourth Proportional to 45.92, 68.78 and 42.05

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Solution

The fourth proportional to 45.92, 68.78 and 42.05 is: 62.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.92 : 68.78 = 42.05 : x
  2. Step 2: Convert to fraction form
    45.92/68.78 = 42.05/x
  3. Step 3: Cross multiply
    45.92x = 68.78 × 42.05
  4. Step 4: Simplify right side
    45.92x = 2,891.64
  5. Step 5: Solve for x
    x = 2,891.64/45.92
  6. Step 6: Final answer
    x = 62.98

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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.