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Finding the Fourth Proportional to 103.06, 154.56 and 80.20

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Solution

The fourth proportional to 103.06, 154.56 and 80.20 is: 120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.06 : 154.56 = 80.20 : x
  2. Step 2: Convert to fraction form
    103.06/154.56 = 80.20/x
  3. Step 3: Cross multiply
    103.06x = 154.56 × 80.20
  4. Step 4: Simplify right side
    103.06x = 12,395.71
  5. Step 5: Solve for x
    x = 12,395.71/103.06
  6. Step 6: Final answer
    x = 120.28

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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.