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Finding the Fourth Proportional to 103.15, 142.23 and 75.54

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Solution

The fourth proportional to 103.15, 142.23 and 75.54 is: 104.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.15 : 142.23 = 75.54 : x
  2. Step 2: Convert to fraction form
    103.15/142.23 = 75.54/x
  3. Step 3: Cross multiply
    103.15x = 142.23 × 75.54
  4. Step 4: Simplify right side
    103.15x = 10,744.05
  5. Step 5: Solve for x
    x = 10,744.05/103.15
  6. Step 6: Final answer
    x = 104.16

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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.