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Finding the Fourth Proportional to 20,453.80, 30,680.70 and 11,689.60

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Solution

The fourth proportional to 20,453.80, 30,680.70 and 11,689.60 is: 17,534.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,453.80 : 30,680.70 = 11,689.60 : x
  2. Step 2: Convert to fraction form
    20,453.80/30,680.70 = 11,689.60/x
  3. Step 3: Cross multiply
    20,453.80x = 30,680.70 × 11,689.60
  4. Step 4: Simplify right side
    20,453.80x = 358,645,110.72
  5. Step 5: Solve for x
    x = 358,645,110.72/20,453.80
  6. Step 6: Final answer
    x = 17,534.40

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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.