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Finding the Fourth Proportional to 139,113.87, 191,959.65 and 77,858.43

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Solution

The fourth proportional to 139,113.87, 191,959.65 and 77,858.43 is: 107,434.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,113.87 : 191,959.65 = 77,858.43 : x
  2. Step 2: Convert to fraction form
    139,113.87/191,959.65 = 77,858.43/x
  3. Step 3: Cross multiply
    139,113.87x = 191,959.65 × 77,858.43
  4. Step 4: Simplify right side
    139,113.87x = 14,945,676,972.35
  5. Step 5: Solve for x
    x = 14,945,676,972.35/139,113.87
  6. Step 6: Final answer
    x = 107,434.84

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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.