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Finding the Fourth Proportional to 207,249.72, 310,425.30 and 128,383.80

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Solution

The fourth proportional to 207,249.72, 310,425.30 and 128,383.80 is: 192,297.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,249.72 : 310,425.30 = 128,383.80 : x
  2. Step 2: Convert to fraction form
    207,249.72/310,425.30 = 128,383.80/x
  3. Step 3: Cross multiply
    207,249.72x = 310,425.30 × 128,383.80
  4. Step 4: Simplify right side
    207,249.72x = 39,853,579,630.14
  5. Step 5: Solve for x
    x = 39,853,579,630.14/207,249.72
  6. Step 6: Final answer
    x = 192,297.39

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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.