Home / 138,400.32-190,982.34-81,800.76

Finding the Fourth Proportional to 138,400.32, 190,982.34 and 81,800.76

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Solution

The fourth proportional to 138,400.32, 190,982.34 and 81,800.76 is: 112,879.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,400.32 : 190,982.34 = 81,800.76 : x
  2. Step 2: Convert to fraction form
    138,400.32/190,982.34 = 81,800.76/x
  3. Step 3: Cross multiply
    138,400.32x = 190,982.34 × 81,800.76
  4. Step 4: Simplify right side
    138,400.32x = 15,622,500,558.58
  5. Step 5: Solve for x
    x = 15,622,500,558.58/138,400.32
  6. Step 6: Final answer
    x = 112,879.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.