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Finding the Fourth Proportional to 1,938.41, 2,907.61 and 639.98

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Solution

The fourth proportional to 1,938.41, 2,907.61 and 639.98 is: 959.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.41 : 2,907.61 = 639.98 : x
  2. Step 2: Convert to fraction form
    1,938.41/2,907.61 = 639.98/x
  3. Step 3: Cross multiply
    1,938.41x = 2,907.61 × 639.98
  4. Step 4: Simplify right side
    1,938.41x = 1,860,812.25
  5. Step 5: Solve for x
    x = 1,860,812.25/1,938.41
  6. Step 6: Final answer
    x = 959.97

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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.