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Finding the Fourth Proportional to 806.49, 1,210.41 and 319.88

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Solution

The fourth proportional to 806.49, 1,210.41 and 319.88 is: 480.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.49 : 1,210.41 = 319.88 : x
  2. Step 2: Convert to fraction form
    806.49/1,210.41 = 319.88/x
  3. Step 3: Cross multiply
    806.49x = 1,210.41 × 319.88
  4. Step 4: Simplify right side
    806.49x = 387,188.98
  5. Step 5: Solve for x
    x = 387,188.98/806.49
  6. Step 6: Final answer
    x = 480.09

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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.