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Finding the Fourth Proportional to 427.47, 639.68 and 376.44

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Solution

The fourth proportional to 427.47, 639.68 and 376.44 is: 563.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.47 : 639.68 = 376.44 : x
  2. Step 2: Convert to fraction form
    427.47/639.68 = 376.44/x
  3. Step 3: Cross multiply
    427.47x = 639.68 × 376.44
  4. Step 4: Simplify right side
    427.47x = 240,801.14
  5. Step 5: Solve for x
    x = 240,801.14/427.47
  6. Step 6: Final answer
    x = 563.32

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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.