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Finding the Fourth Proportional to 683.85, 1,025.30 and 318.45

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Solution

The fourth proportional to 683.85, 1,025.30 and 318.45 is: 477.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.85 : 1,025.30 = 318.45 : x
  2. Step 2: Convert to fraction form
    683.85/1,025.30 = 318.45/x
  3. Step 3: Cross multiply
    683.85x = 1,025.30 × 318.45
  4. Step 4: Simplify right side
    683.85x = 326,506.79
  5. Step 5: Solve for x
    x = 326,506.79/683.85
  6. Step 6: Final answer
    x = 477.45

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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.