Home / 138,121.14-190,621.92-80,778

Finding the Fourth Proportional to 138,121.14, 190,621.92 and 80,778

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Solution

The fourth proportional to 138,121.14, 190,621.92 and 80,778 is: 111,482.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,121.14 : 190,621.92 = 80,778 : x
  2. Step 2: Convert to fraction form
    138,121.14/190,621.92 = 80,778/x
  3. Step 3: Cross multiply
    138,121.14x = 190,621.92 × 80,778
  4. Step 4: Simplify right side
    138,121.14x = 15,398,057,453.76
  5. Step 5: Solve for x
    x = 15,398,057,453.76/138,121.14
  6. Step 6: Final answer
    x = 111,482.26

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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.