Home / 121,631.49-167,928.66-78,631.70

Finding the Fourth Proportional to 121,631.49, 167,928.66 and 78,631.70

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Solution

The fourth proportional to 121,631.49, 167,928.66 and 78,631.70 is: 108,561.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,631.49 : 167,928.66 = 78,631.70 : x
  2. Step 2: Convert to fraction form
    121,631.49/167,928.66 = 78,631.70/x
  3. Step 3: Cross multiply
    121,631.49x = 167,928.66 × 78,631.70
  4. Step 4: Simplify right side
    121,631.49x = 13,204,515,174.88
  5. Step 5: Solve for x
    x = 13,204,515,174.88/121,631.49
  6. Step 6: Final answer
    x = 108,561.65

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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.