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Finding the Fourth Proportional to 85,921.65, 128,729.97 and 35,891.64

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Solution

The fourth proportional to 85,921.65, 128,729.97 and 35,891.64 is: 53,773.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,921.65 : 128,729.97 = 35,891.64 : x
  2. Step 2: Convert to fraction form
    85,921.65/128,729.97 = 35,891.64/x
  3. Step 3: Cross multiply
    85,921.65x = 128,729.97 × 35,891.64
  4. Step 4: Simplify right side
    85,921.65x = 4,620,329,740.45
  5. Step 5: Solve for x
    x = 4,620,329,740.45/85,921.65
  6. Step 6: Final answer
    x = 53,773.75

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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.