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Finding the Fourth Proportional to 428,358.60, 641,760.30 and 261,952.20

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Solution

The fourth proportional to 428,358.60, 641,760.30 and 261,952.20 is: 392,452.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,358.60 : 641,760.30 = 261,952.20 : x
  2. Step 2: Convert to fraction form
    428,358.60/641,760.30 = 261,952.20/x
  3. Step 3: Cross multiply
    428,358.60x = 641,760.30 × 261,952.20
  4. Step 4: Simplify right side
    428,358.60x = 168,110,522,457.66
  5. Step 5: Solve for x
    x = 168,110,522,457.66/428,358.60
  6. Step 6: Final answer
    x = 392,452.78

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1.5x scale

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.