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Finding the Fourth Proportional to 1,938.87, 2,907.23 and 639.63

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Solution

The fourth proportional to 1,938.87, 2,907.23 and 639.63 is: 959.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.87 : 2,907.23 = 639.63 : x
  2. Step 2: Convert to fraction form
    1,938.87/2,907.23 = 639.63/x
  3. Step 3: Cross multiply
    1,938.87x = 2,907.23 × 639.63
  4. Step 4: Simplify right side
    1,938.87x = 1,859,548.33
  5. Step 5: Solve for x
    x = 1,859,548.33/1,938.87
  6. Step 6: Final answer
    x = 959.09

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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.