Home / 2,021.11-2,787.88-1,390.55

Finding the Fourth Proportional to 2,021.11, 2,787.88 and 1,390.55

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Solution

The fourth proportional to 2,021.11, 2,787.88 and 1,390.55 is: 1,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,021.11 : 2,787.88 = 1,390.55 : x
  2. Step 2: Convert to fraction form
    2,021.11/2,787.88 = 1,390.55/x
  3. Step 3: Cross multiply
    2,021.11x = 2,787.88 × 1,390.55
  4. Step 4: Simplify right side
    2,021.11x = 3,876,686.53
  5. Step 5: Solve for x
    x = 3,876,686.53/2,021.11
  6. Step 6: Final answer
    x = 1,918.10

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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.