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Finding the Fourth Proportional to 372,189.36, 513,754.92 and 221,286

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Solution

The fourth proportional to 372,189.36, 513,754.92 and 221,286 is: 305,454.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    372,189.36 : 513,754.92 = 221,286 : x
  2. Step 2: Convert to fraction form
    372,189.36/513,754.92 = 221,286/x
  3. Step 3: Cross multiply
    372,189.36x = 513,754.92 × 221,286
  4. Step 4: Simplify right side
    372,189.36x = 113,686,771,227.12
  5. Step 5: Solve for x
    x = 113,686,771,227.12/372,189.36
  6. Step 6: Final answer
    x = 305,454.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.