Home / 2,780.28-4,170.48-1,319.58

Finding the Fourth Proportional to 2,780.28, 4,170.48 and 1,319.58

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Solution

The fourth proportional to 2,780.28, 4,170.48 and 1,319.58 is: 1,979.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.28 : 4,170.48 = 1,319.58 : x
  2. Step 2: Convert to fraction form
    2,780.28/4,170.48 = 1,319.58/x
  3. Step 3: Cross multiply
    2,780.28x = 4,170.48 × 1,319.58
  4. Step 4: Simplify right side
    2,780.28x = 5,503,282.00
  5. Step 5: Solve for x
    x = 5,503,282.00/2,780.28
  6. Step 6: Final answer
    x = 1,979.40

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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.