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Finding the Fourth Proportional to 103.20, 142.36 and 90.92

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Solution

The fourth proportional to 103.20, 142.36 and 90.92 is: 125.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.20 : 142.36 = 90.92 : x
  2. Step 2: Convert to fraction form
    103.20/142.36 = 90.92/x
  3. Step 3: Cross multiply
    103.20x = 142.36 × 90.92
  4. Step 4: Simplify right side
    103.20x = 12,943.37
  5. Step 5: Solve for x
    x = 12,943.37/103.20
  6. Step 6: Final answer
    x = 125.42

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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.