Home / 20,531.60-28,336.20-11,579.60

Finding the Fourth Proportional to 20,531.60, 28,336.20 and 11,579.60

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Solution

The fourth proportional to 20,531.60, 28,336.20 and 11,579.60 is: 15,981.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,531.60 : 28,336.20 = 11,579.60 : x
  2. Step 2: Convert to fraction form
    20,531.60/28,336.20 = 11,579.60/x
  3. Step 3: Cross multiply
    20,531.60x = 28,336.20 × 11,579.60
  4. Step 4: Simplify right side
    20,531.60x = 328,121,861.52
  5. Step 5: Solve for x
    x = 328,121,861.52/20,531.60
  6. Step 6: Final answer
    x = 15,981.31

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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.