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Finding the Fourth Proportional to 139,861.99, 193,009.56 and 76,199.79

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Solution

The fourth proportional to 139,861.99, 193,009.56 and 76,199.79 is: 105,155.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,861.99 : 193,009.56 = 76,199.79 : x
  2. Step 2: Convert to fraction form
    139,861.99/193,009.56 = 76,199.79/x
  3. Step 3: Cross multiply
    139,861.99x = 193,009.56 × 76,199.79
  4. Step 4: Simplify right side
    139,861.99x = 14,707,287,939.99
  5. Step 5: Solve for x
    x = 14,707,287,939.99/139,861.99
  6. Step 6: Final answer
    x = 105,155.72

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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.