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Finding the Fourth Proportional to 683.78, 1,025.85 and 359.06

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Solution

The fourth proportional to 683.78, 1,025.85 and 359.06 is: 538.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.78 : 1,025.85 = 359.06 : x
  2. Step 2: Convert to fraction form
    683.78/1,025.85 = 359.06/x
  3. Step 3: Cross multiply
    683.78x = 1,025.85 × 359.06
  4. Step 4: Simplify right side
    683.78x = 368,341.70
  5. Step 5: Solve for x
    x = 368,341.70/683.78
  6. Step 6: Final answer
    x = 538.68

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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.