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Finding the Fourth Proportional to 804.40, 1,206.50 and 317.79

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Solution

The fourth proportional to 804.40, 1,206.50 and 317.79 is: 476.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.40 : 1,206.50 = 317.79 : x
  2. Step 2: Convert to fraction form
    804.40/1,206.50 = 317.79/x
  3. Step 3: Cross multiply
    804.40x = 1,206.50 × 317.79
  4. Step 4: Simplify right side
    804.40x = 383,412.05
  5. Step 5: Solve for x
    x = 383,412.05/804.40
  6. Step 6: Final answer
    x = 476.64

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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.