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Finding the Fourth Proportional to 1,760.40, 2,638.32 and 939

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Solution

The fourth proportional to 1,760.40, 2,638.32 and 939 is: 1,407.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,760.40 : 2,638.32 = 939 : x
  2. Step 2: Convert to fraction form
    1,760.40/2,638.32 = 939/x
  3. Step 3: Cross multiply
    1,760.40x = 2,638.32 × 939
  4. Step 4: Simplify right side
    1,760.40x = 2,477,382.48
  5. Step 5: Solve for x
    x = 2,477,382.48/1,760.40
  6. Step 6: Final answer
    x = 1,407.28

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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.