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Finding the Fourth Proportional to 103.21, 154.81 and 31.08

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Solution

The fourth proportional to 103.21, 154.81 and 31.08 is: 46.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.21 : 154.81 = 31.08 : x
  2. Step 2: Convert to fraction form
    103.21/154.81 = 31.08/x
  3. Step 3: Cross multiply
    103.21x = 154.81 × 31.08
  4. Step 4: Simplify right side
    103.21x = 4,812.11
  5. Step 5: Solve for x
    x = 4,812.11/103.21
  6. Step 6: Final answer
    x = 46.63

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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.