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Finding the Fourth Proportional to 85,788.80, 128,540.90 and 60,704.48

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Solution

The fourth proportional to 85,788.80, 128,540.90 and 60,704.48 is: 90,956.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,788.80 : 128,540.90 = 60,704.48 : x
  2. Step 2: Convert to fraction form
    85,788.80/128,540.90 = 60,704.48/x
  3. Step 3: Cross multiply
    85,788.80x = 128,540.90 × 60,704.48
  4. Step 4: Simplify right side
    85,788.80x = 7,803,008,493.23
  5. Step 5: Solve for x
    x = 7,803,008,493.23/85,788.80
  6. Step 6: Final answer
    x = 90,956.03

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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.