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Finding the Fourth Proportional to 128,605.80, 192,908.70 and 86,615.40

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Solution

The fourth proportional to 128,605.80, 192,908.70 and 86,615.40 is: 129,923.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.80 : 192,908.70 = 86,615.40 : x
  2. Step 2: Convert to fraction form
    128,605.80/192,908.70 = 86,615.40/x
  3. Step 3: Cross multiply
    128,605.80x = 192,908.70 × 86,615.40
  4. Step 4: Simplify right side
    128,605.80x = 16,708,864,213.98
  5. Step 5: Solve for x
    x = 16,708,864,213.98/128,605.80
  6. Step 6: Final answer
    x = 129,923.10

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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.