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Finding the Fourth Proportional to 639, 953.19 and 628.43

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Solution

The fourth proportional to 639, 953.19 and 628.43 is: 937.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 953.19 = 628.43 : x
  2. Step 2: Convert to fraction form
    639/953.19 = 628.43/x
  3. Step 3: Cross multiply
    639x = 953.19 × 628.43
  4. Step 4: Simplify right side
    639x = 599,013.19
  5. Step 5: Solve for x
    x = 599,013.19/639
  6. Step 6: Final answer
    x = 937.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.