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Finding the Fourth Proportional to 1,028.88, 1,548.90 and 939.60

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Solution

The fourth proportional to 1,028.88, 1,548.90 and 939.60 is: 1,414.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.88 : 1,548.90 = 939.60 : x
  2. Step 2: Convert to fraction form
    1,028.88/1,548.90 = 939.60/x
  3. Step 3: Cross multiply
    1,028.88x = 1,548.90 × 939.60
  4. Step 4: Simplify right side
    1,028.88x = 1,455,346.44
  5. Step 5: Solve for x
    x = 1,455,346.44/1,028.88
  6. Step 6: Final answer
    x = 1,414.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.