Home / 81,126.36-121,490.82-66,999.96

Finding the Fourth Proportional to 81,126.36, 121,490.82 and 66,999.96

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Solution

The fourth proportional to 81,126.36, 121,490.82 and 66,999.96 is: 100,335.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,126.36 : 121,490.82 = 66,999.96 : x
  2. Step 2: Convert to fraction form
    81,126.36/121,490.82 = 66,999.96/x
  3. Step 3: Cross multiply
    81,126.36x = 121,490.82 × 66,999.96
  4. Step 4: Simplify right side
    81,126.36x = 8,139,880,080.37
  5. Step 5: Solve for x
    x = 8,139,880,080.37/81,126.36
  6. Step 6: Final answer
    x = 100,335.82

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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.