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Finding the Fourth Proportional to 121,869, 168,198.78 and 71,558.28

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Solution

The fourth proportional to 121,869, 168,198.78 and 71,558.28 is: 98,761.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,869 : 168,198.78 = 71,558.28 : x
  2. Step 2: Convert to fraction form
    121,869/168,198.78 = 71,558.28/x
  3. Step 3: Cross multiply
    121,869x = 168,198.78 × 71,558.28
  4. Step 4: Simplify right side
    121,869x = 12,036,015,394.90
  5. Step 5: Solve for x
    x = 12,036,015,394.90/121,869
  6. Step 6: Final answer
    x = 98,761.91

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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.