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Finding the Fourth Proportional to 189,210.87, 261,112.86 and 104,330.97

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Solution

The fourth proportional to 189,210.87, 261,112.86 and 104,330.97 is: 143,977.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,210.87 : 261,112.86 = 104,330.97 : x
  2. Step 2: Convert to fraction form
    189,210.87/261,112.86 = 104,330.97/x
  3. Step 3: Cross multiply
    189,210.87x = 261,112.86 × 104,330.97
  4. Step 4: Simplify right side
    189,210.87x = 27,242,157,963.27
  5. Step 5: Solve for x
    x = 27,242,157,963.27/189,210.87
  6. Step 6: Final answer
    x = 143,977.76

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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.