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Finding the Fourth Proportional to 686.72, 1,029.39 and 443.41

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Solution

The fourth proportional to 686.72, 1,029.39 and 443.41 is: 664.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.72 : 1,029.39 = 443.41 : x
  2. Step 2: Convert to fraction form
    686.72/1,029.39 = 443.41/x
  3. Step 3: Cross multiply
    686.72x = 1,029.39 × 443.41
  4. Step 4: Simplify right side
    686.72x = 456,441.82
  5. Step 5: Solve for x
    x = 456,441.82/686.72
  6. Step 6: Final answer
    x = 664.67

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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.