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Finding the Fourth Proportional to 806.83, 1,210.08 and 319.39

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Solution

The fourth proportional to 806.83, 1,210.08 and 319.39 is: 479.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.83 : 1,210.08 = 319.39 : x
  2. Step 2: Convert to fraction form
    806.83/1,210.08 = 319.39/x
  3. Step 3: Cross multiply
    806.83x = 1,210.08 × 319.39
  4. Step 4: Simplify right side
    806.83x = 386,487.45
  5. Step 5: Solve for x
    x = 386,487.45/806.83
  6. Step 6: Final answer
    x = 479.02

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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.