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Finding the Fourth Proportional to 313,979.20, 470,968.80 and 279,572.80

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Solution

The fourth proportional to 313,979.20, 470,968.80 and 279,572.80 is: 419,359.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,979.20 : 470,968.80 = 279,572.80 : x
  2. Step 2: Convert to fraction form
    313,979.20/470,968.80 = 279,572.80/x
  3. Step 3: Cross multiply
    313,979.20x = 470,968.80 × 279,572.80
  4. Step 4: Simplify right side
    313,979.20x = 131,670,066,128.64
  5. Step 5: Solve for x
    x = 131,670,066,128.64/313,979.20
  6. Step 6: Final answer
    x = 419,359.20

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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.