Home / 128,518.80-192,778.20-86,528.40

Finding the Fourth Proportional to 128,518.80, 192,778.20 and 86,528.40

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Solution

The fourth proportional to 128,518.80, 192,778.20 and 86,528.40 is: 129,792.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,518.80 : 192,778.20 = 86,528.40 : x
  2. Step 2: Convert to fraction form
    128,518.80/192,778.20 = 86,528.40/x
  3. Step 3: Cross multiply
    128,518.80x = 192,778.20 × 86,528.40
  4. Step 4: Simplify right side
    128,518.80x = 16,680,789,200.88
  5. Step 5: Solve for x
    x = 16,680,789,200.88/128,518.80
  6. Step 6: Final answer
    x = 129,792.60

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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.