Home / 20,856.26-28,768.38-13,686.64

Finding the Fourth Proportional to 20,856.26, 28,768.38 and 13,686.64

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Solution

The fourth proportional to 20,856.26, 28,768.38 and 13,686.64 is: 18,878.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.26 : 28,768.38 = 13,686.64 : x
  2. Step 2: Convert to fraction form
    20,856.26/28,768.38 = 13,686.64/x
  3. Step 3: Cross multiply
    20,856.26x = 28,768.38 × 13,686.64
  4. Step 4: Simplify right side
    20,856.26x = 393,742,460.44
  5. Step 5: Solve for x
    x = 393,742,460.44/20,856.26
  6. Step 6: Final answer
    x = 18,878.86

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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.