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Finding the Fourth Proportional to 804.14, 1,206.15 and 317.20

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Solution

The fourth proportional to 804.14, 1,206.15 and 317.20 is: 475.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.14 : 1,206.15 = 317.20 : x
  2. Step 2: Convert to fraction form
    804.14/1,206.15 = 317.20/x
  3. Step 3: Cross multiply
    804.14x = 1,206.15 × 317.20
  4. Step 4: Simplify right side
    804.14x = 382,583.16
  5. Step 5: Solve for x
    x = 382,583.16/804.14
  6. Step 6: Final answer
    x = 475.77

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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.