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Finding the Fourth Proportional to 122.47, 168.83 and 87.39

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Solution

The fourth proportional to 122.47, 168.83 and 87.39 is: 120.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.47 : 168.83 = 87.39 : x
  2. Step 2: Convert to fraction form
    122.47/168.83 = 87.39/x
  3. Step 3: Cross multiply
    122.47x = 168.83 × 87.39
  4. Step 4: Simplify right side
    122.47x = 14,754.05
  5. Step 5: Solve for x
    x = 14,754.05/122.47
  6. Step 6: Final answer
    x = 120.47

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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.