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Finding the Fourth Proportional to 45.78, 67.92 and 45.42

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Solution

The fourth proportional to 45.78, 67.92 and 45.42 is: 67.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.78 : 67.92 = 45.42 : x
  2. Step 2: Convert to fraction form
    45.78/67.92 = 45.42/x
  3. Step 3: Cross multiply
    45.78x = 67.92 × 45.42
  4. Step 4: Simplify right side
    45.78x = 3,084.93
  5. Step 5: Solve for x
    x = 3,084.93/45.78
  6. Step 6: Final answer
    x = 67.39

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.