Home / 128,280.15-192,451.55-90,403.30

Finding the Fourth Proportional to 128,280.15, 192,451.55 and 90,403.30

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Solution

The fourth proportional to 128,280.15, 192,451.55 and 90,403.30 is: 135,627.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,280.15 : 192,451.55 = 90,403.30 : x
  2. Step 2: Convert to fraction form
    128,280.15/192,451.55 = 90,403.30/x
  3. Step 3: Cross multiply
    128,280.15x = 192,451.55 × 90,403.30
  4. Step 4: Simplify right side
    128,280.15x = 17,398,254,998.66
  5. Step 5: Solve for x
    x = 17,398,254,998.66/128,280.15
  6. Step 6: Final answer
    x = 135,627.02

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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.