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Finding the Fourth Proportional to 20,489.60, 30,708.72 and 10,623.20

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Solution

The fourth proportional to 20,489.60, 30,708.72 and 10,623.20 is: 15,921.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.60 : 30,708.72 = 10,623.20 : x
  2. Step 2: Convert to fraction form
    20,489.60/30,708.72 = 10,623.20/x
  3. Step 3: Cross multiply
    20,489.60x = 30,708.72 × 10,623.20
  4. Step 4: Simplify right side
    20,489.60x = 326,224,874.30
  5. Step 5: Solve for x
    x = 326,224,874.30/20,489.60
  6. Step 6: Final answer
    x = 15,921.49

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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.