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Finding the Fourth Proportional to 111,998.78, 154,558.26 and 61,697.78

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Solution

The fourth proportional to 111,998.78, 154,558.26 and 61,697.78 is: 85,142.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,998.78 : 154,558.26 = 61,697.78 : x
  2. Step 2: Convert to fraction form
    111,998.78/154,558.26 = 61,697.78/x
  3. Step 3: Cross multiply
    111,998.78x = 154,558.26 × 61,697.78
  4. Step 4: Simplify right side
    111,998.78x = 9,535,901,522.66
  5. Step 5: Solve for x
    x = 9,535,901,522.66/111,998.78
  6. Step 6: Final answer
    x = 85,142.91

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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.