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Finding the Fourth Proportional to 85,609.40, 128,414.10 and 80,425.40

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Solution

The fourth proportional to 85,609.40, 128,414.10 and 80,425.40 is: 120,638.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,609.40 : 128,414.10 = 80,425.40 : x
  2. Step 2: Convert to fraction form
    85,609.40/128,414.10 = 80,425.40/x
  3. Step 3: Cross multiply
    85,609.40x = 128,414.10 × 80,425.40
  4. Step 4: Simplify right side
    85,609.40x = 10,327,755,358.14
  5. Step 5: Solve for x
    x = 10,327,755,358.14/85,609.40
  6. Step 6: Final answer
    x = 120,638.10

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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.