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Finding the Fourth Proportional to 103.08, 142.37 and 79.99

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Solution

The fourth proportional to 103.08, 142.37 and 79.99 is: 110.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.08 : 142.37 = 79.99 : x
  2. Step 2: Convert to fraction form
    103.08/142.37 = 79.99/x
  3. Step 3: Cross multiply
    103.08x = 142.37 × 79.99
  4. Step 4: Simplify right side
    103.08x = 11,388.18
  5. Step 5: Solve for x
    x = 11,388.18/103.08
  6. Step 6: Final answer
    x = 110.48

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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.