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Finding the Fourth Proportional to 121,980.44, 168,409.41 and 78,390.67

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Solution

The fourth proportional to 121,980.44, 168,409.41 and 78,390.67 is: 108,228.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,980.44 : 168,409.41 = 78,390.67 : x
  2. Step 2: Convert to fraction form
    121,980.44/168,409.41 = 78,390.67/x
  3. Step 3: Cross multiply
    121,980.44x = 168,409.41 × 78,390.67
  4. Step 4: Simplify right side
    121,980.44x = 13,201,726,063.18
  5. Step 5: Solve for x
    x = 13,201,726,063.18/121,980.44
  6. Step 6: Final answer
    x = 108,228.23

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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.