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Finding the Fourth Proportional to 320,428.80, 480,643.20 and 267,940.80

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Solution

The fourth proportional to 320,428.80, 480,643.20 and 267,940.80 is: 401,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,428.80 : 480,643.20 = 267,940.80 : x
  2. Step 2: Convert to fraction form
    320,428.80/480,643.20 = 267,940.80/x
  3. Step 3: Cross multiply
    320,428.80x = 480,643.20 × 267,940.80
  4. Step 4: Simplify right side
    320,428.80x = 128,783,923,522.56
  5. Step 5: Solve for x
    x = 128,783,923,522.56/320,428.80
  6. Step 6: Final answer
    x = 401,911.20

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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.