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Finding the Fourth Proportional to 2,918.33, 4,377.55 and 838.40

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Solution

The fourth proportional to 2,918.33, 4,377.55 and 838.40 is: 1,257.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,918.33 : 4,377.55 = 838.40 : x
  2. Step 2: Convert to fraction form
    2,918.33/4,377.55 = 838.40/x
  3. Step 3: Cross multiply
    2,918.33x = 4,377.55 × 838.40
  4. Step 4: Simplify right side
    2,918.33x = 3,670,137.92
  5. Step 5: Solve for x
    x = 3,670,137.92/2,918.33
  6. Step 6: Final answer
    x = 1,257.62

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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.