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Finding the Fourth Proportional to 803.68, 1,204.08 and 418.72

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Solution

The fourth proportional to 803.68, 1,204.08 and 418.72 is: 627.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.68 : 1,204.08 = 418.72 : x
  2. Step 2: Convert to fraction form
    803.68/1,204.08 = 418.72/x
  3. Step 3: Cross multiply
    803.68x = 1,204.08 × 418.72
  4. Step 4: Simplify right side
    803.68x = 504,172.38
  5. Step 5: Solve for x
    x = 504,172.38/803.68
  6. Step 6: Final answer
    x = 627.33

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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.