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Finding the Fourth Proportional to 804.65, 1,207.15 and 393.57

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Solution

The fourth proportional to 804.65, 1,207.15 and 393.57 is: 590.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.65 : 1,207.15 = 393.57 : x
  2. Step 2: Convert to fraction form
    804.65/1,207.15 = 393.57/x
  3. Step 3: Cross multiply
    804.65x = 1,207.15 × 393.57
  4. Step 4: Simplify right side
    804.65x = 475,097.04
  5. Step 5: Solve for x
    x = 475,097.04/804.65
  6. Step 6: Final answer
    x = 590.44

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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.