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Finding the Fourth Proportional to 69,428.72, 103,640.50 and 61,021.28

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Solution

The fourth proportional to 69,428.72, 103,640.50 and 61,021.28 is: 91,090.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,428.72 : 103,640.50 = 61,021.28 : x
  2. Step 2: Convert to fraction form
    69,428.72/103,640.50 = 61,021.28/x
  3. Step 3: Cross multiply
    69,428.72x = 103,640.50 × 61,021.28
  4. Step 4: Simplify right side
    69,428.72x = 6,324,275,969.84
  5. Step 5: Solve for x
    x = 6,324,275,969.84/69,428.72
  6. Step 6: Final answer
    x = 91,090.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.