Home / 2,155.87-3,231.33-921.43

Finding the Fourth Proportional to 2,155.87, 3,231.33 and 921.43

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Solution

The fourth proportional to 2,155.87, 3,231.33 and 921.43 is: 1,381.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.87 : 3,231.33 = 921.43 : x
  2. Step 2: Convert to fraction form
    2,155.87/3,231.33 = 921.43/x
  3. Step 3: Cross multiply
    2,155.87x = 3,231.33 × 921.43
  4. Step 4: Simplify right side
    2,155.87x = 2,977,444.40
  5. Step 5: Solve for x
    x = 2,977,444.40/2,155.87
  6. Step 6: Final answer
    x = 1,381.09

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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.