Home / 78,138.36-117,206.66-18,974.00

Finding the Fourth Proportional to 78,138.36, 117,206.66 and 18,974.00

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Solution

The fourth proportional to 78,138.36, 117,206.66 and 18,974.00 is: 28,460.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,138.36 : 117,206.66 = 18,974.00 : x
  2. Step 2: Convert to fraction form
    78,138.36/117,206.66 = 18,974.00/x
  3. Step 3: Cross multiply
    78,138.36x = 117,206.66 × 18,974.00
  4. Step 4: Simplify right side
    78,138.36x = 2,223,879,507.29
  5. Step 5: Solve for x
    x = 2,223,879,507.29/78,138.36
  6. Step 6: Final answer
    x = 28,460.79

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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.