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Finding the Fourth Proportional to 90,768.40, 136,037.40 and 80,861.20

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Solution

The fourth proportional to 90,768.40, 136,037.40 and 80,861.20 is: 121,189.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,768.40 : 136,037.40 = 80,861.20 : x
  2. Step 2: Convert to fraction form
    90,768.40/136,037.40 = 80,861.20/x
  3. Step 3: Cross multiply
    90,768.40x = 136,037.40 × 80,861.20
  4. Step 4: Simplify right side
    90,768.40x = 11,000,147,408.88
  5. Step 5: Solve for x
    x = 11,000,147,408.88/90,768.40
  6. Step 6: Final answer
    x = 121,189.17

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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.