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Finding the Fourth Proportional to 683.90, 1,024.42 and 387.04

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Solution

The fourth proportional to 683.90, 1,024.42 and 387.04 is: 579.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.90 : 1,024.42 = 387.04 : x
  2. Step 2: Convert to fraction form
    683.90/1,024.42 = 387.04/x
  3. Step 3: Cross multiply
    683.90x = 1,024.42 × 387.04
  4. Step 4: Simplify right side
    683.90x = 396,484.46
  5. Step 5: Solve for x
    x = 396,484.46/683.90
  6. Step 6: Final answer
    x = 579.74

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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.