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Finding the Fourth Proportional to 85,849.20, 128,514.60 and 75,481.20

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Solution

The fourth proportional to 85,849.20, 128,514.60 and 75,481.20 is: 112,993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,849.20 : 128,514.60 = 75,481.20 : x
  2. Step 2: Convert to fraction form
    85,849.20/128,514.60 = 75,481.20/x
  3. Step 3: Cross multiply
    85,849.20x = 128,514.60 × 75,481.20
  4. Step 4: Simplify right side
    85,849.20x = 9,700,436,225.52
  5. Step 5: Solve for x
    x = 9,700,436,225.52/85,849.20
  6. Step 6: Final answer
    x = 112,993.90

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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.