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Finding the Fourth Proportional to 683.10, 1,023.39 and 393.66

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Solution

The fourth proportional to 683.10, 1,023.39 and 393.66 is: 589.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.10 : 1,023.39 = 393.66 : x
  2. Step 2: Convert to fraction form
    683.10/1,023.39 = 393.66/x
  3. Step 3: Cross multiply
    683.10x = 1,023.39 × 393.66
  4. Step 4: Simplify right side
    683.10x = 402,867.71
  5. Step 5: Solve for x
    x = 402,867.71/683.10
  6. Step 6: Final answer
    x = 589.76

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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.