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Finding the Fourth Proportional to 91,872.33, 137,687.55 and 85,879.24

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Solution

The fourth proportional to 91,872.33, 137,687.55 and 85,879.24 is: 128,705.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,872.33 : 137,687.55 = 85,879.24 : x
  2. Step 2: Convert to fraction form
    91,872.33/137,687.55 = 85,879.24/x
  3. Step 3: Cross multiply
    91,872.33x = 137,687.55 × 85,879.24
  4. Step 4: Simplify right side
    91,872.33x = 11,824,501,485.20
  5. Step 5: Solve for x
    x = 11,824,501,485.20/91,872.33
  6. Step 6: Final answer
    x = 128,705.80

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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.