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Finding the Fourth Proportional to 804.08, 1,205.40 and 317.42

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Solution

The fourth proportional to 804.08, 1,205.40 and 317.42 is: 475.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.08 : 1,205.40 = 317.42 : x
  2. Step 2: Convert to fraction form
    804.08/1,205.40 = 317.42/x
  3. Step 3: Cross multiply
    804.08x = 1,205.40 × 317.42
  4. Step 4: Simplify right side
    804.08x = 382,618.07
  5. Step 5: Solve for x
    x = 382,618.07/804.08
  6. Step 6: Final answer
    x = 475.85

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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.