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Finding the Fourth Proportional to 639.46, 957.17 and 443.47

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Solution

The fourth proportional to 639.46, 957.17 and 443.47 is: 663.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.46 : 957.17 = 443.47 : x
  2. Step 2: Convert to fraction form
    639.46/957.17 = 443.47/x
  3. Step 3: Cross multiply
    639.46x = 957.17 × 443.47
  4. Step 4: Simplify right side
    639.46x = 424,476.18
  5. Step 5: Solve for x
    x = 424,476.18/639.46
  6. Step 6: Final answer
    x = 663.80

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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.