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Finding the Fourth Proportional to 139,341.94, 192,285.44 and 78,913.02

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Solution

The fourth proportional to 139,341.94, 192,285.44 and 78,913.02 is: 108,896.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,341.94 : 192,285.44 = 78,913.02 : x
  2. Step 2: Convert to fraction form
    139,341.94/192,285.44 = 78,913.02/x
  3. Step 3: Cross multiply
    139,341.94x = 192,285.44 × 78,913.02
  4. Step 4: Simplify right side
    139,341.94x = 15,173,823,811.00
  5. Step 5: Solve for x
    x = 15,173,823,811.00/139,341.94
  6. Step 6: Final answer
    x = 108,896.32

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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.