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Finding the Fourth Proportional to 70.66, 106.00 and 19.31

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Solution

The fourth proportional to 70.66, 106.00 and 19.31 is: 28.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.66 : 106.00 = 19.31 : x
  2. Step 2: Convert to fraction form
    70.66/106.00 = 19.31/x
  3. Step 3: Cross multiply
    70.66x = 106.00 × 19.31
  4. Step 4: Simplify right side
    70.66x = 2,046.28
  5. Step 5: Solve for x
    x = 2,046.28/70.66
  6. Step 6: Final answer
    x = 28.96

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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.