Home / 81,210.36-121,785.16-27,887.20

Finding the Fourth Proportional to 81,210.36, 121,785.16 and 27,887.20

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Solution

The fourth proportional to 81,210.36, 121,785.16 and 27,887.20 is: 41,820.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,210.36 : 121,785.16 = 27,887.20 : x
  2. Step 2: Convert to fraction form
    81,210.36/121,785.16 = 27,887.20/x
  3. Step 3: Cross multiply
    81,210.36x = 121,785.16 × 27,887.20
  4. Step 4: Simplify right side
    81,210.36x = 3,396,247,113.95
  5. Step 5: Solve for x
    x = 3,396,247,113.95/81,210.36
  6. Step 6: Final answer
    x = 41,820.37

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1.5x scale

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.