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Finding the Fourth Proportional to 427.84, 644.40 and 382.72

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Solution

The fourth proportional to 427.84, 644.40 and 382.72 is: 576.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.84 : 644.40 = 382.72 : x
  2. Step 2: Convert to fraction form
    427.84/644.40 = 382.72/x
  3. Step 3: Cross multiply
    427.84x = 644.40 × 382.72
  4. Step 4: Simplify right side
    427.84x = 246,624.77
  5. Step 5: Solve for x
    x = 246,624.77/427.84
  6. Step 6: Final answer
    x = 576.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.