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Finding the Fourth Proportional to 804.69, 1,205.42 and 515.25

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Solution

The fourth proportional to 804.69, 1,205.42 and 515.25 is: 771.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.69 : 1,205.42 = 515.25 : x
  2. Step 2: Convert to fraction form
    804.69/1,205.42 = 515.25/x
  3. Step 3: Cross multiply
    804.69x = 1,205.42 × 515.25
  4. Step 4: Simplify right side
    804.69x = 621,090.08
  5. Step 5: Solve for x
    x = 621,090.08/804.69
  6. Step 6: Final answer
    x = 771.84

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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.