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Finding the Fourth Proportional to 804.35, 1,205.75 and 310.39

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Solution

The fourth proportional to 804.35, 1,205.75 and 310.39 is: 465.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.35 : 1,205.75 = 310.39 : x
  2. Step 2: Convert to fraction form
    804.35/1,205.75 = 310.39/x
  3. Step 3: Cross multiply
    804.35x = 1,205.75 × 310.39
  4. Step 4: Simplify right side
    804.35x = 374,251.19
  5. Step 5: Solve for x
    x = 374,251.19/804.35
  6. Step 6: Final answer
    x = 465.29

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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.