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Finding the Fourth Proportional to 45.20, 67.78 and 19.50

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Solution

The fourth proportional to 45.20, 67.78 and 19.50 is: 29.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.20 : 67.78 = 19.50 : x
  2. Step 2: Convert to fraction form
    45.20/67.78 = 19.50/x
  3. Step 3: Cross multiply
    45.20x = 67.78 × 19.50
  4. Step 4: Simplify right side
    45.20x = 1,321.61
  5. Step 5: Solve for x
    x = 1,321.61/45.20
  6. Step 6: Final answer
    x = 29.24

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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.