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Finding the Fourth Proportional to 122.13, 181.98 and 115.56

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Solution

The fourth proportional to 122.13, 181.98 and 115.56 is: 172.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.13 : 181.98 = 115.56 : x
  2. Step 2: Convert to fraction form
    122.13/181.98 = 115.56/x
  3. Step 3: Cross multiply
    122.13x = 181.98 × 115.56
  4. Step 4: Simplify right side
    122.13x = 21,029.61
  5. Step 5: Solve for x
    x = 21,029.61/122.13
  6. Step 6: Final answer
    x = 172.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.