Home / 5,108.40-7,660.80-1,821.60

Finding the Fourth Proportional to 5,108.40, 7,660.80 and 1,821.60

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Solution

The fourth proportional to 5,108.40, 7,660.80 and 1,821.60 is: 2,731.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,108.40 : 7,660.80 = 1,821.60 : x
  2. Step 2: Convert to fraction form
    5,108.40/7,660.80 = 1,821.60/x
  3. Step 3: Cross multiply
    5,108.40x = 7,660.80 × 1,821.60
  4. Step 4: Simplify right side
    5,108.40x = 13,954,913.28
  5. Step 5: Solve for x
    x = 13,954,913.28/5,108.40
  6. Step 6: Final answer
    x = 2,731.76

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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.