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Finding the Fourth Proportional to 111,839.70, 154,313.42 and 81,641.46

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Solution

The fourth proportional to 111,839.70, 154,313.42 and 81,641.46 is: 112,646.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,839.70 : 154,313.42 = 81,641.46 : x
  2. Step 2: Convert to fraction form
    111,839.70/154,313.42 = 81,641.46/x
  3. Step 3: Cross multiply
    111,839.70x = 154,313.42 × 81,641.46
  4. Step 4: Simplify right side
    111,839.70x = 12,598,372,906.39
  5. Step 5: Solve for x
    x = 12,598,372,906.39/111,839.70
  6. Step 6: Final answer
    x = 112,646.70

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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.