Home / 1,780.21-2,669.90-481.78

Finding the Fourth Proportional to 1,780.21, 2,669.90 and 481.78

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Solution

The fourth proportional to 1,780.21, 2,669.90 and 481.78 is: 722.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.21 : 2,669.90 = 481.78 : x
  2. Step 2: Convert to fraction form
    1,780.21/2,669.90 = 481.78/x
  3. Step 3: Cross multiply
    1,780.21x = 2,669.90 × 481.78
  4. Step 4: Simplify right side
    1,780.21x = 1,286,304.42
  5. Step 5: Solve for x
    x = 1,286,304.42/1,780.21
  6. Step 6: Final answer
    x = 722.56

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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.