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Finding the Fourth Proportional to 139,064.77, 191,838.74 and 87,991.44

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Solution

The fourth proportional to 139,064.77, 191,838.74 and 87,991.44 is: 121,383.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,064.77 : 191,838.74 = 87,991.44 : x
  2. Step 2: Convert to fraction form
    139,064.77/191,838.74 = 87,991.44/x
  3. Step 3: Cross multiply
    139,064.77x = 191,838.74 × 87,991.44
  4. Step 4: Simplify right side
    139,064.77x = 16,880,166,980.39
  5. Step 5: Solve for x
    x = 16,880,166,980.39/139,064.77
  6. Step 6: Final answer
    x = 121,383.49

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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.