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Finding the Fourth Proportional to 77,912.66, 116,969.44 and 66,890.18

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Solution

The fourth proportional to 77,912.66, 116,969.44 and 66,890.18 is: 100,421.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,912.66 : 116,969.44 = 66,890.18 : x
  2. Step 2: Convert to fraction form
    77,912.66/116,969.44 = 66,890.18/x
  3. Step 3: Cross multiply
    77,912.66x = 116,969.44 × 66,890.18
  4. Step 4: Simplify right side
    77,912.66x = 7,824,106,896.10
  5. Step 5: Solve for x
    x = 7,824,106,896.10/77,912.66
  6. Step 6: Final answer
    x = 100,421.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.