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Finding the Fourth Proportional to 122.36, 168.71 and 98.98

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Solution

The fourth proportional to 122.36, 168.71 and 98.98 is: 136.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.36 : 168.71 = 98.98 : x
  2. Step 2: Convert to fraction form
    122.36/168.71 = 98.98/x
  3. Step 3: Cross multiply
    122.36x = 168.71 × 98.98
  4. Step 4: Simplify right side
    122.36x = 16,698.00
  5. Step 5: Solve for x
    x = 16,698.00/122.36
  6. Step 6: Final answer
    x = 136.47

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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.