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Finding the Fourth Proportional to 139,551.80, 192,499.25 and 87,786.36

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Solution

The fourth proportional to 139,551.80, 192,499.25 and 87,786.36 is: 121,093.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,551.80 : 192,499.25 = 87,786.36 : x
  2. Step 2: Convert to fraction form
    139,551.80/192,499.25 = 87,786.36/x
  3. Step 3: Cross multiply
    139,551.80x = 192,499.25 × 87,786.36
  4. Step 4: Simplify right side
    139,551.80x = 16,898,808,021.30
  5. Step 5: Solve for x
    x = 16,898,808,021.30/139,551.80
  6. Step 6: Final answer
    x = 121,093.45

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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.