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Finding the Fourth Proportional to 140,136.80, 210,059.40 and 76,859.60

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Solution

The fourth proportional to 140,136.80, 210,059.40 and 76,859.60 is: 115,209.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,136.80 : 210,059.40 = 76,859.60 : x
  2. Step 2: Convert to fraction form
    140,136.80/210,059.40 = 76,859.60/x
  3. Step 3: Cross multiply
    140,136.80x = 210,059.40 × 76,859.60
  4. Step 4: Simplify right side
    140,136.80x = 16,145,081,460.24
  5. Step 5: Solve for x
    x = 16,145,081,460.24/140,136.80
  6. Step 6: Final answer
    x = 115,209.43

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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.