Home / 128,140.40-192,210.60-121,725.20

Finding the Fourth Proportional to 128,140.40, 192,210.60 and 121,725.20

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Solution

The fourth proportional to 128,140.40, 192,210.60 and 121,725.20 is: 182,587.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,140.40 : 192,210.60 = 121,725.20 : x
  2. Step 2: Convert to fraction form
    128,140.40/192,210.60 = 121,725.20/x
  3. Step 3: Cross multiply
    128,140.40x = 192,210.60 × 121,725.20
  4. Step 4: Simplify right side
    128,140.40x = 23,396,873,727.12
  5. Step 5: Solve for x
    x = 23,396,873,727.12/128,140.40
  6. Step 6: Final answer
    x = 182,587.80

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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.