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Finding the Fourth Proportional to 128,203.80, 192,305.70 and 54,322.20

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Solution

The fourth proportional to 128,203.80, 192,305.70 and 54,322.20 is: 81,483.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,203.80 : 192,305.70 = 54,322.20 : x
  2. Step 2: Convert to fraction form
    128,203.80/192,305.70 = 54,322.20/x
  3. Step 3: Cross multiply
    128,203.80x = 192,305.70 × 54,322.20
  4. Step 4: Simplify right side
    128,203.80x = 10,446,468,696.54
  5. Step 5: Solve for x
    x = 10,446,468,696.54/128,203.80
  6. Step 6: Final answer
    x = 81,483.30

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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.