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Finding the Fourth Proportional to 103.44, 142.84 and 84.00

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Solution

The fourth proportional to 103.44, 142.84 and 84.00 is: 115.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.44 : 142.84 = 84.00 : x
  2. Step 2: Convert to fraction form
    103.44/142.84 = 84.00/x
  3. Step 3: Cross multiply
    103.44x = 142.84 × 84.00
  4. Step 4: Simplify right side
    103.44x = 11,997.64
  5. Step 5: Solve for x
    x = 11,997.64/103.44
  6. Step 6: Final answer
    x = 115.99

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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.