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Finding the Fourth Proportional to 609.86, 913.47 and 320.69

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Solution

The fourth proportional to 609.86, 913.47 and 320.69 is: 480.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.86 : 913.47 = 320.69 : x
  2. Step 2: Convert to fraction form
    609.86/913.47 = 320.69/x
  3. Step 3: Cross multiply
    609.86x = 913.47 × 320.69
  4. Step 4: Simplify right side
    609.86x = 292,940.69
  5. Step 5: Solve for x
    x = 292,940.69/609.86
  6. Step 6: Final answer
    x = 480.34

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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.