Home / 138,072.89-190,539.39-77,642.25

Finding the Fourth Proportional to 138,072.89, 190,539.39 and 77,642.25

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Solution

The fourth proportional to 138,072.89, 190,539.39 and 77,642.25 is: 107,145.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,072.89 : 190,539.39 = 77,642.25 : x
  2. Step 2: Convert to fraction form
    138,072.89/190,539.39 = 77,642.25/x
  3. Step 3: Cross multiply
    138,072.89x = 190,539.39 × 77,642.25
  4. Step 4: Simplify right side
    138,072.89x = 14,793,906,093.13
  5. Step 5: Solve for x
    x = 14,793,906,093.13/138,072.89
  6. Step 6: Final answer
    x = 107,145.63

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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.