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Finding the Fourth Proportional to 609.11, 913.12 and 320.21

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Solution

The fourth proportional to 609.11, 913.12 and 320.21 is: 480.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.11 : 913.12 = 320.21 : x
  2. Step 2: Convert to fraction form
    609.11/913.12 = 320.21/x
  3. Step 3: Cross multiply
    609.11x = 913.12 × 320.21
  4. Step 4: Simplify right side
    609.11x = 292,384.79
  5. Step 5: Solve for x
    x = 292,384.79/609.11
  6. Step 6: Final answer
    x = 480.02

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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.