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Finding the Fourth Proportional to 428.32, 591.20 and 329.92

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Solution

The fourth proportional to 428.32, 591.20 and 329.92 is: 455.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.32 : 591.20 = 329.92 : x
  2. Step 2: Convert to fraction form
    428.32/591.20 = 329.92/x
  3. Step 3: Cross multiply
    428.32x = 591.20 × 329.92
  4. Step 4: Simplify right side
    428.32x = 195,048.70
  5. Step 5: Solve for x
    x = 195,048.70/428.32
  6. Step 6: Final answer
    x = 455.38

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Why These Related Problems?

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