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Finding the Fourth Proportional to 399,007.80, 598,511.70 and 309,778.20

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Solution

The fourth proportional to 399,007.80, 598,511.70 and 309,778.20 is: 464,667.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,007.80 : 598,511.70 = 309,778.20 : x
  2. Step 2: Convert to fraction form
    399,007.80/598,511.70 = 309,778.20/x
  3. Step 3: Cross multiply
    399,007.80x = 598,511.70 × 309,778.20
  4. Step 4: Simplify right side
    399,007.80x = 185,405,877,104.94
  5. Step 5: Solve for x
    x = 185,405,877,104.94/399,007.80
  6. Step 6: Final answer
    x = 464,667.30

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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.