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Finding the Fourth Proportional to 111,729.87, 154,187.42 and 61,428.87

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Solution

The fourth proportional to 111,729.87, 154,187.42 and 61,428.87 is: 84,771.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,729.87 : 154,187.42 = 61,428.87 : x
  2. Step 2: Convert to fraction form
    111,729.87/154,187.42 = 61,428.87/x
  3. Step 3: Cross multiply
    111,729.87x = 154,187.42 × 61,428.87
  4. Step 4: Simplify right side
    111,729.87x = 9,471,558,671.67
  5. Step 5: Solve for x
    x = 9,471,558,671.67/111,729.87
  6. Step 6: Final answer
    x = 84,771.95

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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.