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Finding the Fourth Proportional to 54,128.70, 81,178.65 and 16,688.70

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Solution

The fourth proportional to 54,128.70, 81,178.65 and 16,688.70 is: 25,028.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,128.70 : 81,178.65 = 16,688.70 : x
  2. Step 2: Convert to fraction form
    54,128.70/81,178.65 = 16,688.70/x
  3. Step 3: Cross multiply
    54,128.70x = 81,178.65 × 16,688.70
  4. Step 4: Simplify right side
    54,128.70x = 1,354,766,136.26
  5. Step 5: Solve for x
    x = 1,354,766,136.26/54,128.70
  6. Step 6: Final answer
    x = 25,028.61

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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.