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Finding the Fourth Proportional to 804.28, 1,109.73 and 485.23

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Solution

The fourth proportional to 804.28, 1,109.73 and 485.23 is: 669.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.28 : 1,109.73 = 485.23 : x
  2. Step 2: Convert to fraction form
    804.28/1,109.73 = 485.23/x
  3. Step 3: Cross multiply
    804.28x = 1,109.73 × 485.23
  4. Step 4: Simplify right side
    804.28x = 538,474.29
  5. Step 5: Solve for x
    x = 538,474.29/804.28
  6. Step 6: Final answer
    x = 669.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.