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Finding the Fourth Proportional to 804.90, 1,205.91 and 317.64

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Solution

The fourth proportional to 804.90, 1,205.91 and 317.64 is: 475.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.90 : 1,205.91 = 317.64 : x
  2. Step 2: Convert to fraction form
    804.90/1,205.91 = 317.64/x
  3. Step 3: Cross multiply
    804.90x = 1,205.91 × 317.64
  4. Step 4: Simplify right side
    804.90x = 383,045.25
  5. Step 5: Solve for x
    x = 383,045.25/804.90
  6. Step 6: Final answer
    x = 475.89

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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.