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Finding the Fourth Proportional to 619.64, 928.38 and 326.70

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Solution

The fourth proportional to 619.64, 928.38 and 326.70 is: 489.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.64 : 928.38 = 326.70 : x
  2. Step 2: Convert to fraction form
    619.64/928.38 = 326.70/x
  3. Step 3: Cross multiply
    619.64x = 928.38 × 326.70
  4. Step 4: Simplify right side
    619.64x = 303,301.75
  5. Step 5: Solve for x
    x = 303,301.75/619.64
  6. Step 6: Final answer
    x = 489.48

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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.