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Finding the Fourth Proportional to 627.81, 939.97 and 432.39

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Solution

The fourth proportional to 627.81, 939.97 and 432.39 is: 647.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.81 : 939.97 = 432.39 : x
  2. Step 2: Convert to fraction form
    627.81/939.97 = 432.39/x
  3. Step 3: Cross multiply
    627.81x = 939.97 × 432.39
  4. Step 4: Simplify right side
    627.81x = 406,433.63
  5. Step 5: Solve for x
    x = 406,433.63/627.81
  6. Step 6: Final answer
    x = 647.38

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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.