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Finding the Fourth Proportional to 609.56, 912.70 and 320.38

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Solution

The fourth proportional to 609.56, 912.70 and 320.38 is: 479.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.56 : 912.70 = 320.38 : x
  2. Step 2: Convert to fraction form
    609.56/912.70 = 320.38/x
  3. Step 3: Cross multiply
    609.56x = 912.70 × 320.38
  4. Step 4: Simplify right side
    609.56x = 292,410.83
  5. Step 5: Solve for x
    x = 292,410.83/609.56
  6. Step 6: Final answer
    x = 479.71

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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.