Home / 121,934.89-168,213.31-78,928.26

Finding the Fourth Proportional to 121,934.89, 168,213.31 and 78,928.26

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Solution

The fourth proportional to 121,934.89, 168,213.31 and 78,928.26 is: 108,884.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,934.89 : 168,213.31 = 78,928.26 : x
  2. Step 2: Convert to fraction form
    121,934.89/168,213.31 = 78,928.26/x
  3. Step 3: Cross multiply
    121,934.89x = 168,213.31 × 78,928.26
  4. Step 4: Simplify right side
    121,934.89x = 13,276,783,867.14
  5. Step 5: Solve for x
    x = 13,276,783,867.14/121,934.89
  6. Step 6: Final answer
    x = 108,884.21

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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.