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Finding the Fourth Proportional to 13,819.60, 20,729.40 and 6,421.60

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Solution

The fourth proportional to 13,819.60, 20,729.40 and 6,421.60 is: 9,632.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,819.60 : 20,729.40 = 6,421.60 : x
  2. Step 2: Convert to fraction form
    13,819.60/20,729.40 = 6,421.60/x
  3. Step 3: Cross multiply
    13,819.60x = 20,729.40 × 6,421.60
  4. Step 4: Simplify right side
    13,819.60x = 133,115,915.04
  5. Step 5: Solve for x
    x = 133,115,915.04/13,819.60
  6. Step 6: Final answer
    x = 9,632.40

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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.