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Finding the Fourth Proportional to 645,089.14, 890,245.86 and 354,722.80

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Solution

The fourth proportional to 645,089.14, 890,245.86 and 354,722.80 is: 489,530.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,089.14 : 890,245.86 = 354,722.80 : x
  2. Step 2: Convert to fraction form
    645,089.14/890,245.86 = 354,722.80/x
  3. Step 3: Cross multiply
    645,089.14x = 890,245.86 × 354,722.80
  4. Step 4: Simplify right side
    645,089.14x = 315,790,504,147.61
  5. Step 5: Solve for x
    x = 315,790,504,147.61/645,089.14
  6. Step 6: Final answer
    x = 489,530.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.