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Finding the Fourth Proportional to 645,268.70, 890,480.99 and 354,892.88

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Solution

The fourth proportional to 645,268.70, 890,480.99 and 354,892.88 is: 489,757.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,268.70 : 890,480.99 = 354,892.88 : x
  2. Step 2: Convert to fraction form
    645,268.70/890,480.99 = 354,892.88/x
  3. Step 3: Cross multiply
    645,268.70x = 890,480.99 × 354,892.88
  4. Step 4: Simplify right side
    645,268.70x = 316,025,363,126.35
  5. Step 5: Solve for x
    x = 316,025,363,126.35/645,268.70
  6. Step 6: Final answer
    x = 489,757.78

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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.