Home / 3,318.40-4,977.60-2,087.20

Finding the Fourth Proportional to 3,318.40, 4,977.60 and 2,087.20

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Solution

The fourth proportional to 3,318.40, 4,977.60 and 2,087.20 is: 3,130.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.40 : 4,977.60 = 2,087.20 : x
  2. Step 2: Convert to fraction form
    3,318.40/4,977.60 = 2,087.20/x
  3. Step 3: Cross multiply
    3,318.40x = 4,977.60 × 2,087.20
  4. Step 4: Simplify right side
    3,318.40x = 10,389,246.72
  5. Step 5: Solve for x
    x = 10,389,246.72/3,318.40
  6. Step 6: Final answer
    x = 3,130.80

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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.