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Finding the Fourth Proportional to 143,136.40, 214,704.60 and 80,928.40

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Solution

The fourth proportional to 143,136.40, 214,704.60 and 80,928.40 is: 121,392.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,136.40 : 214,704.60 = 80,928.40 : x
  2. Step 2: Convert to fraction form
    143,136.40/214,704.60 = 80,928.40/x
  3. Step 3: Cross multiply
    143,136.40x = 214,704.60 × 80,928.40
  4. Step 4: Simplify right side
    143,136.40x = 17,375,699,750.64
  5. Step 5: Solve for x
    x = 17,375,699,750.64/143,136.40
  6. Step 6: Final answer
    x = 121,392.60

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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.