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Finding the Fourth Proportional to 139,053.02, 191,894.64 and 81,694.74

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Solution

The fourth proportional to 139,053.02, 191,894.64 and 81,694.74 is: 112,739.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,053.02 : 191,894.64 = 81,694.74 : x
  2. Step 2: Convert to fraction form
    139,053.02/191,894.64 = 81,694.74/x
  3. Step 3: Cross multiply
    139,053.02x = 191,894.64 × 81,694.74
  4. Step 4: Simplify right side
    139,053.02x = 15,676,782,722.19
  5. Step 5: Solve for x
    x = 15,676,782,722.19/139,053.02
  6. Step 6: Final answer
    x = 112,739.61

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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.