Home / 135,629.78-187,159.94-78,271.49

Finding the Fourth Proportional to 135,629.78, 187,159.94 and 78,271.49

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Solution

The fourth proportional to 135,629.78, 187,159.94 and 78,271.49 is: 108,009.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,629.78 : 187,159.94 = 78,271.49 : x
  2. Step 2: Convert to fraction form
    135,629.78/187,159.94 = 78,271.49/x
  3. Step 3: Cross multiply
    135,629.78x = 187,159.94 × 78,271.49
  4. Step 4: Simplify right side
    135,629.78x = 14,649,287,448.65
  5. Step 5: Solve for x
    x = 14,649,287,448.65/135,629.78
  6. Step 6: Final answer
    x = 108,009.37

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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.