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Finding the Fourth Proportional to 428.72, 591.33 and 330.32

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Solution

The fourth proportional to 428.72, 591.33 and 330.32 is: 455.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.72 : 591.33 = 330.32 : x
  2. Step 2: Convert to fraction form
    428.72/591.33 = 330.32/x
  3. Step 3: Cross multiply
    428.72x = 591.33 × 330.32
  4. Step 4: Simplify right side
    428.72x = 195,328.13
  5. Step 5: Solve for x
    x = 195,328.13/428.72
  6. Step 6: Final answer
    x = 455.61

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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.