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Finding the Fourth Proportional to 720,147.60, 1,080,221.40 and 221,446.80

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Solution

The fourth proportional to 720,147.60, 1,080,221.40 and 221,446.80 is: 332,170.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,147.60 : 1,080,221.40 = 221,446.80 : x
  2. Step 2: Convert to fraction form
    720,147.60/1,080,221.40 = 221,446.80/x
  3. Step 3: Cross multiply
    720,147.60x = 1,080,221.40 × 221,446.80
  4. Step 4: Simplify right side
    720,147.60x = 239,211,572,321.52
  5. Step 5: Solve for x
    x = 239,211,572,321.52/720,147.60
  6. Step 6: Final answer
    x = 332,170.20

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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.