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Finding the Fourth Proportional to 108,729.20, 162,940.20 and 80,428.40

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Solution

The fourth proportional to 108,729.20, 162,940.20 and 80,428.40 is: 120,528.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,729.20 : 162,940.20 = 80,428.40 : x
  2. Step 2: Convert to fraction form
    108,729.20/162,940.20 = 80,428.40/x
  3. Step 3: Cross multiply
    108,729.20x = 162,940.20 × 80,428.40
  4. Step 4: Simplify right side
    108,729.20x = 13,105,019,581.68
  5. Step 5: Solve for x
    x = 13,105,019,581.68/108,729.20
  6. Step 6: Final answer
    x = 120,528.98

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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.