Home / 127,979.40-191,969.10-81,438.60

Finding the Fourth Proportional to 127,979.40, 191,969.10 and 81,438.60

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Solution

The fourth proportional to 127,979.40, 191,969.10 and 81,438.60 is: 122,157.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,979.40 : 191,969.10 = 81,438.60 : x
  2. Step 2: Convert to fraction form
    127,979.40/191,969.10 = 81,438.60/x
  3. Step 3: Cross multiply
    127,979.40x = 191,969.10 × 81,438.60
  4. Step 4: Simplify right side
    127,979.40x = 15,633,694,747.26
  5. Step 5: Solve for x
    x = 15,633,694,747.26/127,979.40
  6. Step 6: Final answer
    x = 122,157.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.