Home / 100,681.07-138,940.40-55,361.97

Finding the Fourth Proportional to 100,681.07, 138,940.40 and 55,361.97

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Solution

The fourth proportional to 100,681.07, 138,940.40 and 55,361.97 is: 76,399.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,681.07 : 138,940.40 = 55,361.97 : x
  2. Step 2: Convert to fraction form
    100,681.07/138,940.40 = 55,361.97/x
  3. Step 3: Cross multiply
    100,681.07x = 138,940.40 × 55,361.97
  4. Step 4: Simplify right side
    100,681.07x = 7,692,014,256.59
  5. Step 5: Solve for x
    x = 7,692,014,256.59/100,681.07
  6. Step 6: Final answer
    x = 76,399.81

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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.