Home / 135,636.69-187,139.79-78,271.68

Finding the Fourth Proportional to 135,636.69, 187,139.79 and 78,271.68

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Solution

The fourth proportional to 135,636.69, 187,139.79 and 78,271.68 is: 107,992.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,636.69 : 187,139.79 = 78,271.68 : x
  2. Step 2: Convert to fraction form
    135,636.69/187,139.79 = 78,271.68/x
  3. Step 3: Cross multiply
    135,636.69x = 187,139.79 × 78,271.68
  4. Step 4: Simplify right side
    135,636.69x = 14,647,745,758.15
  5. Step 5: Solve for x
    x = 14,647,745,758.15/135,636.69
  6. Step 6: Final answer
    x = 107,992.50

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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.