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Finding the Fourth Proportional to 67.47, 101.21 and 19.38

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Solution

The fourth proportional to 67.47, 101.21 and 19.38 is: 29.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.47 : 101.21 = 19.38 : x
  2. Step 2: Convert to fraction form
    67.47/101.21 = 19.38/x
  3. Step 3: Cross multiply
    67.47x = 101.21 × 19.38
  4. Step 4: Simplify right side
    67.47x = 1,961.35
  5. Step 5: Solve for x
    x = 1,961.35/67.47
  6. Step 6: Final answer
    x = 29.07

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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.