Home / 77,078.39-115,619.92-20,918.30

Finding the Fourth Proportional to 77,078.39, 115,619.92 and 20,918.30

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Solution

The fourth proportional to 77,078.39, 115,619.92 and 20,918.30 is: 31,378.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,078.39 : 115,619.92 = 20,918.30 : x
  2. Step 2: Convert to fraction form
    77,078.39/115,619.92 = 20,918.30/x
  3. Step 3: Cross multiply
    77,078.39x = 115,619.92 × 20,918.30
  4. Step 4: Simplify right side
    77,078.39x = 2,418,571,542.14
  5. Step 5: Solve for x
    x = 2,418,571,542.14/77,078.39
  6. Step 6: Final answer
    x = 31,378.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.