Home / 128,728.20-192,800.70-76,240.20

Finding the Fourth Proportional to 128,728.20, 192,800.70 and 76,240.20

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Solution

The fourth proportional to 128,728.20, 192,800.70 and 76,240.20 is: 114,187.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,728.20 : 192,800.70 = 76,240.20 : x
  2. Step 2: Convert to fraction form
    128,728.20/192,800.70 = 76,240.20/x
  3. Step 3: Cross multiply
    128,728.20x = 192,800.70 × 76,240.20
  4. Step 4: Simplify right side
    128,728.20x = 14,699,163,928.14
  5. Step 5: Solve for x
    x = 14,699,163,928.14/128,728.20
  6. Step 6: Final answer
    x = 114,187.60

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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.