Home / 20,531.20-28,339.20-13,081.60

Finding the Fourth Proportional to 20,531.20, 28,339.20 and 13,081.60

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Solution

The fourth proportional to 20,531.20, 28,339.20 and 13,081.60 is: 18,056.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,531.20 : 28,339.20 = 13,081.60 : x
  2. Step 2: Convert to fraction form
    20,531.20/28,339.20 = 13,081.60/x
  3. Step 3: Cross multiply
    20,531.20x = 28,339.20 × 13,081.60
  4. Step 4: Simplify right side
    20,531.20x = 370,722,078.72
  5. Step 5: Solve for x
    x = 370,722,078.72/20,531.20
  6. Step 6: Final answer
    x = 18,056.52

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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.