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Finding the Fourth Proportional to 639,360, 959,057.28 and 196,128

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Solution

The fourth proportional to 639,360, 959,057.28 and 196,128 is: 294,197.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,360 : 959,057.28 = 196,128 : x
  2. Step 2: Convert to fraction form
    639,360/959,057.28 = 196,128/x
  3. Step 3: Cross multiply
    639,360x = 959,057.28 × 196,128
  4. Step 4: Simplify right side
    639,360x = 188,097,986,211.84
  5. Step 5: Solve for x
    x = 188,097,986,211.84/639,360
  6. Step 6: Final answer
    x = 294,197.30

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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.