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Finding the Fourth Proportional to 559.28, 771.76 and 326.40

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Solution

The fourth proportional to 559.28, 771.76 and 326.40 is: 450.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.28 : 771.76 = 326.40 : x
  2. Step 2: Convert to fraction form
    559.28/771.76 = 326.40/x
  3. Step 3: Cross multiply
    559.28x = 771.76 × 326.40
  4. Step 4: Simplify right side
    559.28x = 251,902.46
  5. Step 5: Solve for x
    x = 251,902.46/559.28
  6. Step 6: Final answer
    x = 450.40

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.