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Finding the Fourth Proportional to 683.39, 1,025.60 and 478.19

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Solution

The fourth proportional to 683.39, 1,025.60 and 478.19 is: 717.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.39 : 1,025.60 = 478.19 : x
  2. Step 2: Convert to fraction form
    683.39/1,025.60 = 478.19/x
  3. Step 3: Cross multiply
    683.39x = 1,025.60 × 478.19
  4. Step 4: Simplify right side
    683.39x = 490,431.84
  5. Step 5: Solve for x
    x = 490,431.84/683.39
  6. Step 6: Final answer
    x = 717.64

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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.