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Finding the Fourth Proportional to 804.80, 1,205.64 and 495.20

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Solution

The fourth proportional to 804.80, 1,205.64 and 495.20 is: 741.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.80 : 1,205.64 = 495.20 : x
  2. Step 2: Convert to fraction form
    804.80/1,205.64 = 495.20/x
  3. Step 3: Cross multiply
    804.80x = 1,205.64 × 495.20
  4. Step 4: Simplify right side
    804.80x = 597,032.93
  5. Step 5: Solve for x
    x = 597,032.93/804.80
  6. Step 6: Final answer
    x = 741.84

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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.