Home / 2,154.90-3,231.18-921.54

Finding the Fourth Proportional to 2,154.90, 3,231.18 and 921.54

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Solution

The fourth proportional to 2,154.90, 3,231.18 and 921.54 is: 1,381.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,154.90 : 3,231.18 = 921.54 : x
  2. Step 2: Convert to fraction form
    2,154.90/3,231.18 = 921.54/x
  3. Step 3: Cross multiply
    2,154.90x = 3,231.18 × 921.54
  4. Step 4: Simplify right side
    2,154.90x = 2,977,661.62
  5. Step 5: Solve for x
    x = 2,977,661.62/2,154.90
  6. Step 6: Final answer
    x = 1,381.81

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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.