Home / 81,018.09-121,539.29-28,418.31

Finding the Fourth Proportional to 81,018.09, 121,539.29 and 28,418.31

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Solution

The fourth proportional to 81,018.09, 121,539.29 and 28,418.31 is: 42,631.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,018.09 : 121,539.29 = 28,418.31 : x
  2. Step 2: Convert to fraction form
    81,018.09/121,539.29 = 28,418.31/x
  3. Step 3: Cross multiply
    81,018.09x = 121,539.29 × 28,418.31
  4. Step 4: Simplify right side
    81,018.09x = 3,453,941,078.31
  5. Step 5: Solve for x
    x = 3,453,941,078.31/81,018.09
  6. Step 6: Final answer
    x = 42,631.73

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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.