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Finding the Fourth Proportional to 683.31, 1,025.04 and 318.21

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Solution

The fourth proportional to 683.31, 1,025.04 and 318.21 is: 477.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.31 : 1,025.04 = 318.21 : x
  2. Step 2: Convert to fraction form
    683.31/1,025.04 = 318.21/x
  3. Step 3: Cross multiply
    683.31x = 1,025.04 × 318.21
  4. Step 4: Simplify right side
    683.31x = 326,177.98
  5. Step 5: Solve for x
    x = 326,177.98/683.31
  6. Step 6: Final answer
    x = 477.35

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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.