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Finding the Fourth Proportional to 1,806.38, 2,709.56 and 438.38

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Solution

The fourth proportional to 1,806.38, 2,709.56 and 438.38 is: 657.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,806.38 : 2,709.56 = 438.38 : x
  2. Step 2: Convert to fraction form
    1,806.38/2,709.56 = 438.38/x
  3. Step 3: Cross multiply
    1,806.38x = 2,709.56 × 438.38
  4. Step 4: Simplify right side
    1,806.38x = 1,187,804.46
  5. Step 5: Solve for x
    x = 1,187,804.46/1,806.38
  6. Step 6: Final answer
    x = 657.56

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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.