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Finding the Fourth Proportional to 13,419.20, 20,128.80 and 10,305.20

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Solution

The fourth proportional to 13,419.20, 20,128.80 and 10,305.20 is: 15,457.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,419.20 : 20,128.80 = 10,305.20 : x
  2. Step 2: Convert to fraction form
    13,419.20/20,128.80 = 10,305.20/x
  3. Step 3: Cross multiply
    13,419.20x = 20,128.80 × 10,305.20
  4. Step 4: Simplify right side
    13,419.20x = 207,431,309.76
  5. Step 5: Solve for x
    x = 207,431,309.76/13,419.20
  6. Step 6: Final answer
    x = 15,457.80

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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.