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Finding the Fourth Proportional to 85,687.87, 128,537.25 and 26,518.57

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Solution

The fourth proportional to 85,687.87, 128,537.25 and 26,518.57 is: 39,779.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.87 : 128,537.25 = 26,518.57 : x
  2. Step 2: Convert to fraction form
    85,687.87/128,537.25 = 26,518.57/x
  3. Step 3: Cross multiply
    85,687.87x = 128,537.25 × 26,518.57
  4. Step 4: Simplify right side
    85,687.87x = 3,408,623,286.45
  5. Step 5: Solve for x
    x = 3,408,623,286.45/85,687.87
  6. Step 6: Final answer
    x = 39,779.53

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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.