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Finding the Fourth Proportional to 90,469.70, 135,704.55 and 81,284.30

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Solution

The fourth proportional to 90,469.70, 135,704.55 and 81,284.30 is: 121,926.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,469.70 : 135,704.55 = 81,284.30 : x
  2. Step 2: Convert to fraction form
    90,469.70/135,704.55 = 81,284.30/x
  3. Step 3: Cross multiply
    90,469.70x = 135,704.55 × 81,284.30
  4. Step 4: Simplify right side
    90,469.70x = 11,030,649,353.57
  5. Step 5: Solve for x
    x = 11,030,649,353.57/90,469.70
  6. Step 6: Final answer
    x = 121,926.45

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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.