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Finding the Fourth Proportional to 683.55, 1,025.80 and 272.78

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Solution

The fourth proportional to 683.55, 1,025.80 and 272.78 is: 409.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.55 : 1,025.80 = 272.78 : x
  2. Step 2: Convert to fraction form
    683.55/1,025.80 = 272.78/x
  3. Step 3: Cross multiply
    683.55x = 1,025.80 × 272.78
  4. Step 4: Simplify right side
    683.55x = 279,815.76
  5. Step 5: Solve for x
    x = 279,815.76/683.55
  6. Step 6: Final answer
    x = 409.36

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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.