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Finding the Fourth Proportional to 135,993.63, 187,660.23 and 78,636.69

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Solution

The fourth proportional to 135,993.63, 187,660.23 and 78,636.69 is: 108,512.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,993.63 : 187,660.23 = 78,636.69 : x
  2. Step 2: Convert to fraction form
    135,993.63/187,660.23 = 78,636.69/x
  3. Step 3: Cross multiply
    135,993.63x = 187,660.23 × 78,636.69
  4. Step 4: Simplify right side
    135,993.63x = 14,756,979,036.95
  5. Step 5: Solve for x
    x = 14,756,979,036.95/135,993.63
  6. Step 6: Final answer
    x = 108,512.28

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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.