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Finding the Fourth Proportional to 103.81, 155.71 and 31.66

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Solution

The fourth proportional to 103.81, 155.71 and 31.66 is: 47.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.81 : 155.71 = 31.66 : x
  2. Step 2: Convert to fraction form
    103.81/155.71 = 31.66/x
  3. Step 3: Cross multiply
    103.81x = 155.71 × 31.66
  4. Step 4: Simplify right side
    103.81x = 4,929.78
  5. Step 5: Solve for x
    x = 4,929.78/103.81
  6. Step 6: Final answer
    x = 47.49

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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.