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Finding the Fourth Proportional to 139,578.05, 192,615.33 and 77,486.39

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Solution

The fourth proportional to 139,578.05, 192,615.33 and 77,486.39 is: 106,929.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,578.05 : 192,615.33 = 77,486.39 : x
  2. Step 2: Convert to fraction form
    139,578.05/192,615.33 = 77,486.39/x
  3. Step 3: Cross multiply
    139,578.05x = 192,615.33 × 77,486.39
  4. Step 4: Simplify right side
    139,578.05x = 14,925,065,617.28
  5. Step 5: Solve for x
    x = 14,925,065,617.28/139,578.05
  6. Step 6: Final answer
    x = 106,929.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.