Home / 2,720.60-4,080.40-1,239.47

Finding the Fourth Proportional to 2,720.60, 4,080.40 and 1,239.47

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Solution

The fourth proportional to 2,720.60, 4,080.40 and 1,239.47 is: 1,858.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.60 : 4,080.40 = 1,239.47 : x
  2. Step 2: Convert to fraction form
    2,720.60/4,080.40 = 1,239.47/x
  3. Step 3: Cross multiply
    2,720.60x = 4,080.40 × 1,239.47
  4. Step 4: Simplify right side
    2,720.60x = 5,057,540.49
  5. Step 5: Solve for x
    x = 5,057,540.49/2,720.60
  6. Step 6: Final answer
    x = 1,858.98

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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.