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Finding the Fourth Proportional to 111,921.28, 154,451.01 and 61,620.28

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Solution

The fourth proportional to 111,921.28, 154,451.01 and 61,620.28 is: 85,035.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,921.28 : 154,451.01 = 61,620.28 : x
  2. Step 2: Convert to fraction form
    111,921.28/154,451.01 = 61,620.28/x
  3. Step 3: Cross multiply
    111,921.28x = 154,451.01 × 61,620.28
  4. Step 4: Simplify right side
    111,921.28x = 9,517,314,482.48
  5. Step 5: Solve for x
    x = 9,517,314,482.48/111,921.28
  6. Step 6: Final answer
    x = 85,035.79

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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.