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Finding the Fourth Proportional to 42.12, 63.09 and 19.26

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Solution

The fourth proportional to 42.12, 63.09 and 19.26 is: 28.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.12 : 63.09 = 19.26 : x
  2. Step 2: Convert to fraction form
    42.12/63.09 = 19.26/x
  3. Step 3: Cross multiply
    42.12x = 63.09 × 19.26
  4. Step 4: Simplify right side
    42.12x = 1,215.11
  5. Step 5: Solve for x
    x = 1,215.11/42.12
  6. Step 6: Final answer
    x = 28.85

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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.