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Finding the Fourth Proportional to 122,107.71, 168,513.87 and 71,112.21

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Solution

The fourth proportional to 122,107.71, 168,513.87 and 71,112.21 is: 98,137.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,107.71 : 168,513.87 = 71,112.21 : x
  2. Step 2: Convert to fraction form
    122,107.71/168,513.87 = 71,112.21/x
  3. Step 3: Cross multiply
    122,107.71x = 168,513.87 × 71,112.21
  4. Step 4: Simplify right side
    122,107.71x = 11,983,394,132.64
  5. Step 5: Solve for x
    x = 11,983,394,132.64/122,107.71
  6. Step 6: Final answer
    x = 98,137.90

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1.5x scale

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.