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Finding the Fourth Proportional to 139,358.17, 192,281.33 and 81,999.98

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Solution

The fourth proportional to 139,358.17, 192,281.33 and 81,999.98 is: 113,140.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,358.17 : 192,281.33 = 81,999.98 : x
  2. Step 2: Convert to fraction form
    139,358.17/192,281.33 = 81,999.98/x
  3. Step 3: Cross multiply
    139,358.17x = 192,281.33 × 81,999.98
  4. Step 4: Simplify right side
    139,358.17x = 15,767,063,842.97
  5. Step 5: Solve for x
    x = 15,767,063,842.97/139,358.17
  6. Step 6: Final answer
    x = 113,140.58

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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.