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Finding the Fourth Proportional to 2,551.65, 3,828.03 and 821.49

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Solution

The fourth proportional to 2,551.65, 3,828.03 and 821.49 is: 1,232.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,551.65 : 3,828.03 = 821.49 : x
  2. Step 2: Convert to fraction form
    2,551.65/3,828.03 = 821.49/x
  3. Step 3: Cross multiply
    2,551.65x = 3,828.03 × 821.49
  4. Step 4: Simplify right side
    2,551.65x = 3,144,688.36
  5. Step 5: Solve for x
    x = 3,144,688.36/2,551.65
  6. Step 6: Final answer
    x = 1,232.41

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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.