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Finding the Fourth Proportional to 645,266.70, 890,478.23 and 354,890.88

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Solution

The fourth proportional to 645,266.70, 890,478.23 and 354,890.88 is: 489,755.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,266.70 : 890,478.23 = 354,890.88 : x
  2. Step 2: Convert to fraction form
    645,266.70/890,478.23 = 354,890.88/x
  3. Step 3: Cross multiply
    645,266.70x = 890,478.23 × 354,890.88
  4. Step 4: Simplify right side
    645,266.70x = 316,022,600,891.09
  5. Step 5: Solve for x
    x = 316,022,600,891.09/645,266.70
  6. Step 6: Final answer
    x = 489,755.01

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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.