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Finding the Fourth Proportional to 319,208.20, 478,812.30 and 279,809.80

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Solution

The fourth proportional to 319,208.20, 478,812.30 and 279,809.80 is: 419,714.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,208.20 : 478,812.30 = 279,809.80 : x
  2. Step 2: Convert to fraction form
    319,208.20/478,812.30 = 279,809.80/x
  3. Step 3: Cross multiply
    319,208.20x = 478,812.30 × 279,809.80
  4. Step 4: Simplify right side
    319,208.20x = 133,976,373,900.54
  5. Step 5: Solve for x
    x = 133,976,373,900.54/319,208.20
  6. Step 6: Final answer
    x = 419,714.70

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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.