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Finding the Fourth Proportional to 143,784.80, 215,515.20 and 68,940.80

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Solution

The fourth proportional to 143,784.80, 215,515.20 and 68,940.80 is: 103,333.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,784.80 : 215,515.20 = 68,940.80 : x
  2. Step 2: Convert to fraction form
    143,784.80/215,515.20 = 68,940.80/x
  3. Step 3: Cross multiply
    143,784.80x = 215,515.20 × 68,940.80
  4. Step 4: Simplify right side
    143,784.80x = 14,857,790,300.16
  5. Step 5: Solve for x
    x = 14,857,790,300.16/143,784.80
  6. Step 6: Final answer
    x = 103,333.53

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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.