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Finding the Fourth Proportional to 203,080.80, 304,160.40 and 128,431.20

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Solution

The fourth proportional to 203,080.80, 304,160.40 and 128,431.20 is: 192,355.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,080.80 : 304,160.40 = 128,431.20 : x
  2. Step 2: Convert to fraction form
    203,080.80/304,160.40 = 128,431.20/x
  3. Step 3: Cross multiply
    203,080.80x = 304,160.40 × 128,431.20
  4. Step 4: Simplify right side
    203,080.80x = 39,063,685,164.48
  5. Step 5: Solve for x
    x = 39,063,685,164.48/203,080.80
  6. Step 6: Final answer
    x = 192,355.38

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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.