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Finding the Fourth Proportional to 67.30, 100.95 and 19.21

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Solution

The fourth proportional to 67.30, 100.95 and 19.21 is: 28.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.30 : 100.95 = 19.21 : x
  2. Step 2: Convert to fraction form
    67.30/100.95 = 19.21/x
  3. Step 3: Cross multiply
    67.30x = 100.95 × 19.21
  4. Step 4: Simplify right side
    67.30x = 1,939.25
  5. Step 5: Solve for x
    x = 1,939.25/67.30
  6. Step 6: Final answer
    x = 28.82

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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.