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Finding the Fourth Proportional to 90,790.76, 136,408.56 and 85,755.20

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Solution

The fourth proportional to 90,790.76, 136,408.56 and 85,755.20 is: 128,842.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,790.76 : 136,408.56 = 85,755.20 : x
  2. Step 2: Convert to fraction form
    90,790.76/136,408.56 = 85,755.20/x
  3. Step 3: Cross multiply
    90,790.76x = 136,408.56 × 85,755.20
  4. Step 4: Simplify right side
    90,790.76x = 11,697,743,344.51
  5. Step 5: Solve for x
    x = 11,697,743,344.51/90,790.76
  6. Step 6: Final answer
    x = 128,842.88

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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.