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Finding the Fourth Proportional to 103.95, 143.34 and 80.60

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Solution

The fourth proportional to 103.95, 143.34 and 80.60 is: 111.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.95 : 143.34 = 80.60 : x
  2. Step 2: Convert to fraction form
    103.95/143.34 = 80.60/x
  3. Step 3: Cross multiply
    103.95x = 143.34 × 80.60
  4. Step 4: Simplify right side
    103.95x = 11,552.49
  5. Step 5: Solve for x
    x = 11,552.49/103.95
  6. Step 6: Final answer
    x = 111.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.