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Finding the Fourth Proportional to 803.21, 1,203.89 and 369.45

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Solution

The fourth proportional to 803.21, 1,203.89 and 369.45 is: 553.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.21 : 1,203.89 = 369.45 : x
  2. Step 2: Convert to fraction form
    803.21/1,203.89 = 369.45/x
  3. Step 3: Cross multiply
    803.21x = 1,203.89 × 369.45
  4. Step 4: Simplify right side
    803.21x = 444,777.16
  5. Step 5: Solve for x
    x = 444,777.16/803.21
  6. Step 6: Final answer
    x = 553.75

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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.