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Finding the Fourth Proportional to 111,821.50, 154,313.67 and 61,520.50

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Solution

The fourth proportional to 111,821.50, 154,313.67 and 61,520.50 is: 84,898.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,821.50 : 154,313.67 = 61,520.50 : x
  2. Step 2: Convert to fraction form
    111,821.50/154,313.67 = 61,520.50/x
  3. Step 3: Cross multiply
    111,821.50x = 154,313.67 × 61,520.50
  4. Step 4: Simplify right side
    111,821.50x = 9,493,454,135.24
  5. Step 5: Solve for x
    x = 9,493,454,135.24/111,821.50
  6. Step 6: Final answer
    x = 84,898.29

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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.