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Finding the Fourth Proportional to 2,755.50, 3,802.95 and 1,915.74

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Solution

The fourth proportional to 2,755.50, 3,802.95 and 1,915.74 is: 2,643.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,755.50 : 3,802.95 = 1,915.74 : x
  2. Step 2: Convert to fraction form
    2,755.50/3,802.95 = 1,915.74/x
  3. Step 3: Cross multiply
    2,755.50x = 3,802.95 × 1,915.74
  4. Step 4: Simplify right side
    2,755.50x = 7,285,463.43
  5. Step 5: Solve for x
    x = 7,285,463.43/2,755.50
  6. Step 6: Final answer
    x = 2,643.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.