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Finding the Fourth Proportional to 85,297.20, 127,945.80 and 81,409.20

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Solution

The fourth proportional to 85,297.20, 127,945.80 and 81,409.20 is: 122,113.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,297.20 : 127,945.80 = 81,409.20 : x
  2. Step 2: Convert to fraction form
    85,297.20/127,945.80 = 81,409.20/x
  3. Step 3: Cross multiply
    85,297.20x = 127,945.80 × 81,409.20
  4. Step 4: Simplify right side
    85,297.20x = 10,415,965,221.36
  5. Step 5: Solve for x
    x = 10,415,965,221.36/85,297.20
  6. Step 6: Final answer
    x = 122,113.80

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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.