Home / 20,619.75-28,455.31-11,188.32

Finding the Fourth Proportional to 20,619.75, 28,455.31 and 11,188.32

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Solution

The fourth proportional to 20,619.75, 28,455.31 and 11,188.32 is: 15,439.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,619.75 : 28,455.31 = 11,188.32 : x
  2. Step 2: Convert to fraction form
    20,619.75/28,455.31 = 11,188.32/x
  3. Step 3: Cross multiply
    20,619.75x = 28,455.31 × 11,188.32
  4. Step 4: Simplify right side
    20,619.75x = 318,367,113.98
  5. Step 5: Solve for x
    x = 318,367,113.98/20,619.75
  6. Step 6: Final answer
    x = 15,439.91

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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.