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Finding the Fourth Proportional to 40.50, 60.80 and 19.17

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Solution

The fourth proportional to 40.50, 60.80 and 19.17 is: 28.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.50 : 60.80 = 19.17 : x
  2. Step 2: Convert to fraction form
    40.50/60.80 = 19.17/x
  3. Step 3: Cross multiply
    40.50x = 60.80 × 19.17
  4. Step 4: Simplify right side
    40.50x = 1,165.44
  5. Step 5: Solve for x
    x = 1,165.44/40.50
  6. Step 6: Final answer
    x = 28.78

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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.