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Finding the Fourth Proportional to 683.30, 1,024.60 and 318.35

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Solution

The fourth proportional to 683.30, 1,024.60 and 318.35 is: 477.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.30 : 1,024.60 = 318.35 : x
  2. Step 2: Convert to fraction form
    683.30/1,024.60 = 318.35/x
  3. Step 3: Cross multiply
    683.30x = 1,024.60 × 318.35
  4. Step 4: Simplify right side
    683.30x = 326,181.41
  5. Step 5: Solve for x
    x = 326,181.41/683.30
  6. Step 6: Final answer
    x = 477.36

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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.