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Finding the Fourth Proportional to 139,063.77, 191,837.36 and 87,990.44

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Solution

The fourth proportional to 139,063.77, 191,837.36 and 87,990.44 is: 121,382.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,063.77 : 191,837.36 = 87,990.44 : x
  2. Step 2: Convert to fraction form
    139,063.77/191,837.36 = 87,990.44/x
  3. Step 3: Cross multiply
    139,063.77x = 191,837.36 × 87,990.44
  4. Step 4: Simplify right side
    139,063.77x = 16,879,852,975.63
  5. Step 5: Solve for x
    x = 16,879,852,975.63/139,063.77
  6. Step 6: Final answer
    x = 121,382.10

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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.