Home / 13,720.13-20,558.31-8,785.70

Finding the Fourth Proportional to 13,720.13, 20,558.31 and 8,785.70

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Solution

The fourth proportional to 13,720.13, 20,558.31 and 8,785.70 is: 13,164.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.13 : 20,558.31 = 8,785.70 : x
  2. Step 2: Convert to fraction form
    13,720.13/20,558.31 = 8,785.70/x
  3. Step 3: Cross multiply
    13,720.13x = 20,558.31 × 8,785.70
  4. Step 4: Simplify right side
    13,720.13x = 180,619,144.17
  5. Step 5: Solve for x
    x = 180,619,144.17/13,720.13
  6. Step 6: Final answer
    x = 13,164.54

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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.