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Finding the Fourth Proportional to 804.40, 1,206.06 and 317.20

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Solution

The fourth proportional to 804.40, 1,206.06 and 317.20 is: 475.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.40 : 1,206.06 = 317.20 : x
  2. Step 2: Convert to fraction form
    804.40/1,206.06 = 317.20/x
  3. Step 3: Cross multiply
    804.40x = 1,206.06 × 317.20
  4. Step 4: Simplify right side
    804.40x = 382,562.23
  5. Step 5: Solve for x
    x = 382,562.23/804.40
  6. Step 6: Final answer
    x = 475.59

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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.