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Finding the Fourth Proportional to 143,889.60, 215,834.40 and 80,644.80

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Solution

The fourth proportional to 143,889.60, 215,834.40 and 80,644.80 is: 120,967.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,889.60 : 215,834.40 = 80,644.80 : x
  2. Step 2: Convert to fraction form
    143,889.60/215,834.40 = 80,644.80/x
  3. Step 3: Cross multiply
    143,889.60x = 215,834.40 × 80,644.80
  4. Step 4: Simplify right side
    143,889.60x = 17,405,922,021.12
  5. Step 5: Solve for x
    x = 17,405,922,021.12/143,889.60
  6. Step 6: Final answer
    x = 120,967.20

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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.