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Finding the Fourth Proportional to 73,129.60, 109,694.40 and 72,668.80

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Solution

The fourth proportional to 73,129.60, 109,694.40 and 72,668.80 is: 109,003.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,129.60 : 109,694.40 = 72,668.80 : x
  2. Step 2: Convert to fraction form
    73,129.60/109,694.40 = 72,668.80/x
  3. Step 3: Cross multiply
    73,129.60x = 109,694.40 × 72,668.80
  4. Step 4: Simplify right side
    73,129.60x = 7,971,360,414.72
  5. Step 5: Solve for x
    x = 7,971,360,414.72/73,129.60
  6. Step 6: Final answer
    x = 109,003.20

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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.