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Finding the Fourth Proportional to 103.44, 155.16 and 31.31

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Solution

The fourth proportional to 103.44, 155.16 and 31.31 is: 46.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.44 : 155.16 = 31.31 : x
  2. Step 2: Convert to fraction form
    103.44/155.16 = 31.31/x
  3. Step 3: Cross multiply
    103.44x = 155.16 × 31.31
  4. Step 4: Simplify right side
    103.44x = 4,857.13
  5. Step 5: Solve for x
    x = 4,857.13/103.44
  6. Step 6: Final answer
    x = 46.96

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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.