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Finding the Fourth Proportional to 683.79, 1,025.52 and 272.81

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Solution

The fourth proportional to 683.79, 1,025.52 and 272.81 is: 409.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.79 : 1,025.52 = 272.81 : x
  2. Step 2: Convert to fraction form
    683.79/1,025.52 = 272.81/x
  3. Step 3: Cross multiply
    683.79x = 1,025.52 × 272.81
  4. Step 4: Simplify right side
    683.79x = 279,770.75
  5. Step 5: Solve for x
    x = 279,770.75/683.79
  6. Step 6: Final answer
    x = 409.15

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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.