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Finding the Fourth Proportional to 20,753.60, 31,081.80 and 12,880.40

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Solution

The fourth proportional to 20,753.60, 31,081.80 and 12,880.40 is: 19,290.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,753.60 : 31,081.80 = 12,880.40 : x
  2. Step 2: Convert to fraction form
    20,753.60/31,081.80 = 12,880.40/x
  3. Step 3: Cross multiply
    20,753.60x = 31,081.80 × 12,880.40
  4. Step 4: Simplify right side
    20,753.60x = 400,346,016.72
  5. Step 5: Solve for x
    x = 400,346,016.72/20,753.60
  6. Step 6: Final answer
    x = 19,290.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.