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Finding the Fourth Proportional to 121,138.40, 181,707.60 and 83,813.60

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Solution

The fourth proportional to 121,138.40, 181,707.60 and 83,813.60 is: 125,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,138.40 : 181,707.60 = 83,813.60 : x
  2. Step 2: Convert to fraction form
    121,138.40/181,707.60 = 83,813.60/x
  3. Step 3: Cross multiply
    121,138.40x = 181,707.60 × 83,813.60
  4. Step 4: Simplify right side
    121,138.40x = 15,229,568,103.36
  5. Step 5: Solve for x
    x = 15,229,568,103.36/121,138.40
  6. Step 6: Final answer
    x = 125,720.40

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1.5x scale

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.