Home / 2,780.60-4,162.80-1,857.20

Finding the Fourth Proportional to 2,780.60, 4,162.80 and 1,857.20

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Solution

The fourth proportional to 2,780.60, 4,162.80 and 1,857.20 is: 2,780.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.60 : 4,162.80 = 1,857.20 : x
  2. Step 2: Convert to fraction form
    2,780.60/4,162.80 = 1,857.20/x
  3. Step 3: Cross multiply
    2,780.60x = 4,162.80 × 1,857.20
  4. Step 4: Simplify right side
    2,780.60x = 7,731,152.16
  5. Step 5: Solve for x
    x = 7,731,152.16/2,780.60
  6. Step 6: Final answer
    x = 2,780.39

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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.