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Finding the Fourth Proportional to 139,257.66, 192,121.74 and 78,814.46

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Solution

The fourth proportional to 139,257.66, 192,121.74 and 78,814.46 is: 108,733.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,257.66 : 192,121.74 = 78,814.46 : x
  2. Step 2: Convert to fraction form
    139,257.66/192,121.74 = 78,814.46/x
  3. Step 3: Cross multiply
    139,257.66x = 192,121.74 × 78,814.46
  4. Step 4: Simplify right side
    139,257.66x = 15,141,971,192.36
  5. Step 5: Solve for x
    x = 15,141,971,192.36/139,257.66
  6. Step 6: Final answer
    x = 108,733.49

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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.