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Finding the Fourth Proportional to 339,936.80, 509,905.20 and 280,839.20

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Solution

The fourth proportional to 339,936.80, 509,905.20 and 280,839.20 is: 421,258.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,936.80 : 509,905.20 = 280,839.20 : x
  2. Step 2: Convert to fraction form
    339,936.80/509,905.20 = 280,839.20/x
  3. Step 3: Cross multiply
    339,936.80x = 509,905.20 × 280,839.20
  4. Step 4: Simplify right side
    339,936.80x = 143,201,368,443.84
  5. Step 5: Solve for x
    x = 143,201,368,443.84/339,936.80
  6. Step 6: Final answer
    x = 421,258.80

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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.