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Finding the Fourth Proportional to 686.14, 1,029.54 and 320.86

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Solution

The fourth proportional to 686.14, 1,029.54 and 320.86 is: 481.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.14 : 1,029.54 = 320.86 : x
  2. Step 2: Convert to fraction form
    686.14/1,029.54 = 320.86/x
  3. Step 3: Cross multiply
    686.14x = 1,029.54 × 320.86
  4. Step 4: Simplify right side
    686.14x = 330,340.69
  5. Step 5: Solve for x
    x = 330,340.69/686.14
  6. Step 6: Final answer
    x = 481.45

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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.