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Finding the Fourth Proportional to 102.36, 141.21 and 77.88

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Solution

The fourth proportional to 102.36, 141.21 and 77.88 is: 107.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.36 : 141.21 = 77.88 : x
  2. Step 2: Convert to fraction form
    102.36/141.21 = 77.88/x
  3. Step 3: Cross multiply
    102.36x = 141.21 × 77.88
  4. Step 4: Simplify right side
    102.36x = 10,997.43
  5. Step 5: Solve for x
    x = 10,997.43/102.36
  6. Step 6: Final answer
    x = 107.44

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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.