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Finding the Fourth Proportional to 2,554.09, 3,828.70 and 821.50

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Solution

The fourth proportional to 2,554.09, 3,828.70 and 821.50 is: 1,231.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,554.09 : 3,828.70 = 821.50 : x
  2. Step 2: Convert to fraction form
    2,554.09/3,828.70 = 821.50/x
  3. Step 3: Cross multiply
    2,554.09x = 3,828.70 × 821.50
  4. Step 4: Simplify right side
    2,554.09x = 3,145,277.05
  5. Step 5: Solve for x
    x = 3,145,277.05/2,554.09
  6. Step 6: Final answer
    x = 1,231.47

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1.5x scale

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.