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Finding the Fourth Proportional to 128,605.74, 192,838.14 and 39,834.60

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Solution

The fourth proportional to 128,605.74, 192,838.14 and 39,834.60 is: 59,730.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.74 : 192,838.14 = 39,834.60 : x
  2. Step 2: Convert to fraction form
    128,605.74/192,838.14 = 39,834.60/x
  3. Step 3: Cross multiply
    128,605.74x = 192,838.14 × 39,834.60
  4. Step 4: Simplify right side
    128,605.74x = 7,681,630,171.64
  5. Step 5: Solve for x
    x = 7,681,630,171.64/128,605.74
  6. Step 6: Final answer
    x = 59,730.07

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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.