Home / 20,395.20-28,174.05-15,739.32

Finding the Fourth Proportional to 20,395.20, 28,174.05 and 15,739.32

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Solution

The fourth proportional to 20,395.20, 28,174.05 and 15,739.32 is: 21,742.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,395.20 : 28,174.05 = 15,739.32 : x
  2. Step 2: Convert to fraction form
    20,395.20/28,174.05 = 15,739.32/x
  3. Step 3: Cross multiply
    20,395.20x = 28,174.05 × 15,739.32
  4. Step 4: Simplify right side
    20,395.20x = 443,440,388.65
  5. Step 5: Solve for x
    x = 443,440,388.65/20,395.20
  6. Step 6: Final answer
    x = 21,742.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.