Home / 128,079.20-191,900.10-81,277.40

Finding the Fourth Proportional to 128,079.20, 191,900.10 and 81,277.40

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Solution

The fourth proportional to 128,079.20, 191,900.10 and 81,277.40 is: 121,777.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,079.20 : 191,900.10 = 81,277.40 : x
  2. Step 2: Convert to fraction form
    128,079.20/191,900.10 = 81,277.40/x
  3. Step 3: Cross multiply
    128,079.20x = 191,900.10 × 81,277.40
  4. Step 4: Simplify right side
    128,079.20x = 15,597,141,187.74
  5. Step 5: Solve for x
    x = 15,597,141,187.74/128,079.20
  6. Step 6: Final answer
    x = 121,777.32

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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.