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Finding the Fourth Proportional to 85,778, 128,736.12 and 44,236.88

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Solution

The fourth proportional to 85,778, 128,736.12 and 44,236.88 is: 66,390.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,778 : 128,736.12 = 44,236.88 : x
  2. Step 2: Convert to fraction form
    85,778/128,736.12 = 44,236.88/x
  3. Step 3: Cross multiply
    85,778x = 128,736.12 × 44,236.88
  4. Step 4: Simplify right side
    85,778x = 5,694,884,292.11
  5. Step 5: Solve for x
    x = 5,694,884,292.11/85,778
  6. Step 6: Final answer
    x = 66,390.97

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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.