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Finding the Fourth Proportional to 309,940.80, 464,911.20 and 257,452.80

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Solution

The fourth proportional to 309,940.80, 464,911.20 and 257,452.80 is: 386,179.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,940.80 : 464,911.20 = 257,452.80 : x
  2. Step 2: Convert to fraction form
    309,940.80/464,911.20 = 257,452.80/x
  3. Step 3: Cross multiply
    309,940.80x = 464,911.20 × 257,452.80
  4. Step 4: Simplify right side
    309,940.80x = 119,692,690,191.36
  5. Step 5: Solve for x
    x = 119,692,690,191.36/309,940.80
  6. Step 6: Final answer
    x = 386,179.20

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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.