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Finding the Fourth Proportional to 90,659.40, 135,989.10 and 90,003.30

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Solution

The fourth proportional to 90,659.40, 135,989.10 and 90,003.30 is: 135,004.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,659.40 : 135,989.10 = 90,003.30 : x
  2. Step 2: Convert to fraction form
    90,659.40/135,989.10 = 90,003.30/x
  3. Step 3: Cross multiply
    90,659.40x = 135,989.10 × 90,003.30
  4. Step 4: Simplify right side
    90,659.40x = 12,239,467,764.03
  5. Step 5: Solve for x
    x = 12,239,467,764.03/90,659.40
  6. Step 6: Final answer
    x = 135,004.95

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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.