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Finding the Fourth Proportional to 804.29, 1,205.62 and 317.15

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Solution

The fourth proportional to 804.29, 1,205.62 and 317.15 is: 475.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.29 : 1,205.62 = 317.15 : x
  2. Step 2: Convert to fraction form
    804.29/1,205.62 = 317.15/x
  3. Step 3: Cross multiply
    804.29x = 1,205.62 × 317.15
  4. Step 4: Simplify right side
    804.29x = 382,362.38
  5. Step 5: Solve for x
    x = 382,362.38/804.29
  6. Step 6: Final answer
    x = 475.40

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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.