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Finding the Fourth Proportional to 139,051.93, 191,890.53 and 78,634.45

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Solution

The fourth proportional to 139,051.93, 191,890.53 and 78,634.45 is: 108,514.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,051.93 : 191,890.53 = 78,634.45 : x
  2. Step 2: Convert to fraction form
    139,051.93/191,890.53 = 78,634.45/x
  3. Step 3: Cross multiply
    139,051.93x = 191,890.53 × 78,634.45
  4. Step 4: Simplify right side
    139,051.93x = 15,089,206,286.76
  5. Step 5: Solve for x
    x = 15,089,206,286.76/139,051.93
  6. Step 6: Final answer
    x = 108,514.90

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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.