Home / 81,921.40-122,786.18-31,287.26

Finding the Fourth Proportional to 81,921.40, 122,786.18 and 31,287.26

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Solution

The fourth proportional to 81,921.40, 122,786.18 and 31,287.26 is: 46,894.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,921.40 : 122,786.18 = 31,287.26 : x
  2. Step 2: Convert to fraction form
    81,921.40/122,786.18 = 31,287.26/x
  3. Step 3: Cross multiply
    81,921.40x = 122,786.18 × 31,287.26
  4. Step 4: Simplify right side
    81,921.40x = 3,841,643,138.07
  5. Step 5: Solve for x
    x = 3,841,643,138.07/81,921.40
  6. Step 6: Final answer
    x = 46,894.26

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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.