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Finding the Fourth Proportional to 683.81, 1,025.00 and 318.30

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Solution

The fourth proportional to 683.81, 1,025.00 and 318.30 is: 477.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.81 : 1,025.00 = 318.30 : x
  2. Step 2: Convert to fraction form
    683.81/1,025.00 = 318.30/x
  3. Step 3: Cross multiply
    683.81x = 1,025.00 × 318.30
  4. Step 4: Simplify right side
    683.81x = 326,258.30
  5. Step 5: Solve for x
    x = 326,258.30/683.81
  6. Step 6: Final answer
    x = 477.12

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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.