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Finding the Fourth Proportional to 683.78, 1,025.88 and 272.91

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Solution

The fourth proportional to 683.78, 1,025.88 and 272.91 is: 409.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.78 : 1,025.88 = 272.91 : x
  2. Step 2: Convert to fraction form
    683.78/1,025.88 = 272.91/x
  3. Step 3: Cross multiply
    683.78x = 1,025.88 × 272.91
  4. Step 4: Simplify right side
    683.78x = 279,972.91
  5. Step 5: Solve for x
    x = 279,972.91/683.78
  6. Step 6: Final answer
    x = 409.45

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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.