Home / 645,213.11-890,347.88-354,845.12

Finding the Fourth Proportional to 645,213.11, 890,347.88 and 354,845.12

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Solution

The fourth proportional to 645,213.11, 890,347.88 and 354,845.12 is: 489,660.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,213.11 : 890,347.88 = 354,845.12 : x
  2. Step 2: Convert to fraction form
    645,213.11/890,347.88 = 354,845.12/x
  3. Step 3: Cross multiply
    645,213.11x = 890,347.88 × 354,845.12
  4. Step 4: Simplify right side
    645,213.11x = 315,935,599,767.92
  5. Step 5: Solve for x
    x = 315,935,599,767.92/645,213.11
  6. Step 6: Final answer
    x = 489,660.85

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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.