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Finding the Fourth Proportional to 142,640.40, 213,879.60 and 53,896.80

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Solution

The fourth proportional to 142,640.40, 213,879.60 and 53,896.80 is: 80,814.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,640.40 : 213,879.60 = 53,896.80 : x
  2. Step 2: Convert to fraction form
    142,640.40/213,879.60 = 53,896.80/x
  3. Step 3: Cross multiply
    142,640.40x = 213,879.60 × 53,896.80
  4. Step 4: Simplify right side
    142,640.40x = 11,527,426,025.28
  5. Step 5: Solve for x
    x = 11,527,426,025.28/142,640.40
  6. Step 6: Final answer
    x = 80,814.59

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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.