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Finding the Fourth Proportional to 639.52, 881.58 and 443.44

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Solution

The fourth proportional to 639.52, 881.58 and 443.44 is: 611.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.52 : 881.58 = 443.44 : x
  2. Step 2: Convert to fraction form
    639.52/881.58 = 443.44/x
  3. Step 3: Cross multiply
    639.52x = 881.58 × 443.44
  4. Step 4: Simplify right side
    639.52x = 390,927.84
  5. Step 5: Solve for x
    x = 390,927.84/639.52
  6. Step 6: Final answer
    x = 611.28

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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.