Home / 2,638.18-3,957.49-690.38

Finding the Fourth Proportional to 2,638.18, 3,957.49 and 690.38

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Solution

The fourth proportional to 2,638.18, 3,957.49 and 690.38 is: 1,035.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.18 : 3,957.49 = 690.38 : x
  2. Step 2: Convert to fraction form
    2,638.18/3,957.49 = 690.38/x
  3. Step 3: Cross multiply
    2,638.18x = 3,957.49 × 690.38
  4. Step 4: Simplify right side
    2,638.18x = 2,732,171.95
  5. Step 5: Solve for x
    x = 2,732,171.95/2,638.18
  6. Step 6: Final answer
    x = 1,035.63

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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.