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Finding the Fourth Proportional to 804.10, 1,205.78 and 316.82

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Solution

The fourth proportional to 804.10, 1,205.78 and 316.82 is: 475.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.10 : 1,205.78 = 316.82 : x
  2. Step 2: Convert to fraction form
    804.10/1,205.78 = 316.82/x
  3. Step 3: Cross multiply
    804.10x = 1,205.78 × 316.82
  4. Step 4: Simplify right side
    804.10x = 382,015.22
  5. Step 5: Solve for x
    x = 382,015.22/804.10
  6. Step 6: Final answer
    x = 475.08

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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.