Home / 128,403.15-192,659.40-81,054.60

Finding the Fourth Proportional to 128,403.15, 192,659.40 and 81,054.60

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Solution

The fourth proportional to 128,403.15, 192,659.40 and 81,054.60 is: 121,616.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,403.15 : 192,659.40 = 81,054.60 : x
  2. Step 2: Convert to fraction form
    128,403.15/192,659.40 = 81,054.60/x
  3. Step 3: Cross multiply
    128,403.15x = 192,659.40 × 81,054.60
  4. Step 4: Simplify right side
    128,403.15x = 15,615,930,603.24
  5. Step 5: Solve for x
    x = 15,615,930,603.24/128,403.15
  6. Step 6: Final answer
    x = 121,616.41

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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.