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Finding the Fourth Proportional to 85,687.54, 128,553.49 and 50,178.86

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Solution

The fourth proportional to 85,687.54, 128,553.49 and 50,178.86 is: 75,281.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.54 : 128,553.49 = 50,178.86 : x
  2. Step 2: Convert to fraction form
    85,687.54/128,553.49 = 50,178.86/x
  3. Step 3: Cross multiply
    85,687.54x = 128,553.49 × 50,178.86
  4. Step 4: Simplify right side
    85,687.54x = 6,450,666,683.56
  5. Step 5: Solve for x
    x = 6,450,666,683.56/85,687.54
  6. Step 6: Final answer
    x = 75,281.27

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1.5x scale

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.