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Finding the Fourth Proportional to 69,427.72, 103,639.01 and 61,020.28

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Solution

The fourth proportional to 69,427.72, 103,639.01 and 61,020.28 is: 91,088.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,427.72 : 103,639.01 = 61,020.28 : x
  2. Step 2: Convert to fraction form
    69,427.72/103,639.01 = 61,020.28/x
  3. Step 3: Cross multiply
    69,427.72x = 103,639.01 × 61,020.28
  4. Step 4: Simplify right side
    69,427.72x = 6,324,081,409.12
  5. Step 5: Solve for x
    x = 6,324,081,409.12/69,427.72
  6. Step 6: Final answer
    x = 91,088.71

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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.