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Finding the Fourth Proportional to 85,880.87, 128,759.02 and 57,731.09

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Solution

The fourth proportional to 85,880.87, 128,759.02 and 57,731.09 is: 86,554.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,880.87 : 128,759.02 = 57,731.09 : x
  2. Step 2: Convert to fraction form
    85,880.87/128,759.02 = 57,731.09/x
  3. Step 3: Cross multiply
    85,880.87x = 128,759.02 × 57,731.09
  4. Step 4: Simplify right side
    85,880.87x = 7,433,398,749.50
  5. Step 5: Solve for x
    x = 7,433,398,749.50/85,880.87
  6. Step 6: Final answer
    x = 86,554.77

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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.