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Finding the Fourth Proportional to 139,083.40, 191,920.98 and 85,370.68

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Solution

The fourth proportional to 139,083.40, 191,920.98 and 85,370.68 is: 117,802.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,083.40 : 191,920.98 = 85,370.68 : x
  2. Step 2: Convert to fraction form
    139,083.40/191,920.98 = 85,370.68/x
  3. Step 3: Cross multiply
    139,083.40x = 191,920.98 × 85,370.68
  4. Step 4: Simplify right side
    139,083.40x = 16,384,424,568.87
  5. Step 5: Solve for x
    x = 16,384,424,568.87/139,083.40
  6. Step 6: Final answer
    x = 117,802.88

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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.