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Finding the Fourth Proportional to 55,240.80, 82,861.20 and 13,687.80

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Solution

The fourth proportional to 55,240.80, 82,861.20 and 13,687.80 is: 20,531.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,240.80 : 82,861.20 = 13,687.80 : x
  2. Step 2: Convert to fraction form
    55,240.80/82,861.20 = 13,687.80/x
  3. Step 3: Cross multiply
    55,240.80x = 82,861.20 × 13,687.80
  4. Step 4: Simplify right side
    55,240.80x = 1,134,187,533.36
  5. Step 5: Solve for x
    x = 1,134,187,533.36/55,240.80
  6. Step 6: Final answer
    x = 20,531.70

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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.