Home / 81,018.59-121,540.04-28,418.81

Finding the Fourth Proportional to 81,018.59, 121,540.04 and 28,418.81

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Solution

The fourth proportional to 81,018.59, 121,540.04 and 28,418.81 is: 42,632.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,018.59 : 121,540.04 = 28,418.81 : x
  2. Step 2: Convert to fraction form
    81,018.59/121,540.04 = 28,418.81/x
  3. Step 3: Cross multiply
    81,018.59x = 121,540.04 × 28,418.81
  4. Step 4: Simplify right side
    81,018.59x = 3,454,023,162.06
  5. Step 5: Solve for x
    x = 3,454,023,162.06/81,018.59
  6. Step 6: Final answer
    x = 42,632.48

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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.