Home / 128,485.12-192,727.07-85,700.11

Finding the Fourth Proportional to 128,485.12, 192,727.07 and 85,700.11

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Solution

The fourth proportional to 128,485.12, 192,727.07 and 85,700.11 is: 128,549.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,485.12 : 192,727.07 = 85,700.11 : x
  2. Step 2: Convert to fraction form
    128,485.12/192,727.07 = 85,700.11/x
  3. Step 3: Cross multiply
    128,485.12x = 192,727.07 × 85,700.11
  4. Step 4: Simplify right side
    128,485.12x = 16,516,731,112.43
  5. Step 5: Solve for x
    x = 16,516,731,112.43/128,485.12
  6. Step 6: Final answer
    x = 128,549.76

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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.