Home / 81,018.34-121,539.66-28,418.56

Finding the Fourth Proportional to 81,018.34, 121,539.66 and 28,418.56

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Solution

The fourth proportional to 81,018.34, 121,539.66 and 28,418.56 is: 42,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,018.34 : 121,539.66 = 28,418.56 : x
  2. Step 2: Convert to fraction form
    81,018.34/121,539.66 = 28,418.56/x
  3. Step 3: Cross multiply
    81,018.34x = 121,539.66 × 28,418.56
  4. Step 4: Simplify right side
    81,018.34x = 3,453,982,120.09
  5. Step 5: Solve for x
    x = 3,453,982,120.09/81,018.34
  6. Step 6: Final answer
    x = 42,632.10

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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.