Home / 1,821.18-2,512.71-1,122.78

Finding the Fourth Proportional to 1,821.18, 2,512.71 and 1,122.78

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Solution

The fourth proportional to 1,821.18, 2,512.71 and 1,122.78 is: 1,549.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.18 : 2,512.71 = 1,122.78 : x
  2. Step 2: Convert to fraction form
    1,821.18/2,512.71 = 1,122.78/x
  3. Step 3: Cross multiply
    1,821.18x = 2,512.71 × 1,122.78
  4. Step 4: Simplify right side
    1,821.18x = 2,821,220.53
  5. Step 5: Solve for x
    x = 2,821,220.53/1,821.18
  6. Step 6: Final answer
    x = 1,549.12

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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.