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Finding the Fourth Proportional to 143,999.20, 215,998.80 and 128,252.80

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Solution

The fourth proportional to 143,999.20, 215,998.80 and 128,252.80 is: 192,379.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,999.20 : 215,998.80 = 128,252.80 : x
  2. Step 2: Convert to fraction form
    143,999.20/215,998.80 = 128,252.80/x
  3. Step 3: Cross multiply
    143,999.20x = 215,998.80 × 128,252.80
  4. Step 4: Simplify right side
    143,999.20x = 27,702,450,896.64
  5. Step 5: Solve for x
    x = 27,702,450,896.64/143,999.20
  6. Step 6: Final answer
    x = 192,379.20

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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.