Home / 13,147.20-19,720.80-3,913.20

Finding the Fourth Proportional to 13,147.20, 19,720.80 and 3,913.20

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Solution

The fourth proportional to 13,147.20, 19,720.80 and 3,913.20 is: 5,869.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,147.20 : 19,720.80 = 3,913.20 : x
  2. Step 2: Convert to fraction form
    13,147.20/19,720.80 = 3,913.20/x
  3. Step 3: Cross multiply
    13,147.20x = 19,720.80 × 3,913.20
  4. Step 4: Simplify right side
    13,147.20x = 77,171,434.56
  5. Step 5: Solve for x
    x = 77,171,434.56/13,147.20
  6. Step 6: Final answer
    x = 5,869.80

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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.