Home / 2,780.89-4,169.84-931.39

Finding the Fourth Proportional to 2,780.89, 4,169.84 and 931.39

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Solution

The fourth proportional to 2,780.89, 4,169.84 and 931.39 is: 1,396.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.89 : 4,169.84 = 931.39 : x
  2. Step 2: Convert to fraction form
    2,780.89/4,169.84 = 931.39/x
  3. Step 3: Cross multiply
    2,780.89x = 4,169.84 × 931.39
  4. Step 4: Simplify right side
    2,780.89x = 3,883,732.20
  5. Step 5: Solve for x
    x = 3,883,732.20/2,780.89
  6. Step 6: Final answer
    x = 1,396.58

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1.5x scale

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.