Home / 5,214.39-7,821.60-1,318.80

Finding the Fourth Proportional to 5,214.39, 7,821.60 and 1,318.80

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Solution

The fourth proportional to 5,214.39, 7,821.60 and 1,318.80 is: 1,978.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,214.39 : 7,821.60 = 1,318.80 : x
  2. Step 2: Convert to fraction form
    5,214.39/7,821.60 = 1,318.80/x
  3. Step 3: Cross multiply
    5,214.39x = 7,821.60 × 1,318.80
  4. Step 4: Simplify right side
    5,214.39x = 10,315,119.49
  5. Step 5: Solve for x
    x = 10,315,119.49/5,214.39
  6. Step 6: Final answer
    x = 1,978.20

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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.