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Finding the Fourth Proportional to 111,997.31, 154,556.28 and 61,696.31

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Solution

The fourth proportional to 111,997.31, 154,556.28 and 61,696.31 is: 85,140.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,997.31 : 154,556.28 = 61,696.31 : x
  2. Step 2: Convert to fraction form
    111,997.31/154,556.28 = 61,696.31/x
  3. Step 3: Cross multiply
    111,997.31x = 154,556.28 × 61,696.31
  4. Step 4: Simplify right side
    111,997.31x = 9,535,551,390.55
  5. Step 5: Solve for x
    x = 9,535,551,390.55/111,997.31
  6. Step 6: Final answer
    x = 85,140.90

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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.