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Finding the Fourth Proportional to 69.86, 104.81 and 31.31

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Solution

The fourth proportional to 69.86, 104.81 and 31.31 is: 46.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.86 : 104.81 = 31.31 : x
  2. Step 2: Convert to fraction form
    69.86/104.81 = 31.31/x
  3. Step 3: Cross multiply
    69.86x = 104.81 × 31.31
  4. Step 4: Simplify right side
    69.86x = 3,281.71
  5. Step 5: Solve for x
    x = 3,281.71/69.86
  6. Step 6: Final answer
    x = 46.98

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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.