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Finding the Fourth Proportional to 102.88, 142.66 and 98.86

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Solution

The fourth proportional to 102.88, 142.66 and 98.86 is: 137.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.88 : 142.66 = 98.86 : x
  2. Step 2: Convert to fraction form
    102.88/142.66 = 98.86/x
  3. Step 3: Cross multiply
    102.88x = 142.66 × 98.86
  4. Step 4: Simplify right side
    102.88x = 14,103.37
  5. Step 5: Solve for x
    x = 14,103.37/102.88
  6. Step 6: Final answer
    x = 137.09

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.