Home / 645,085.12-890,240.32-354,718.80

Finding the Fourth Proportional to 645,085.12, 890,240.32 and 354,718.80

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Solution

The fourth proportional to 645,085.12, 890,240.32 and 354,718.80 is: 489,524.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,085.12 : 890,240.32 = 354,718.80 : x
  2. Step 2: Convert to fraction form
    645,085.12/890,240.32 = 354,718.80/x
  3. Step 3: Cross multiply
    645,085.12x = 890,240.32 × 354,718.80
  4. Step 4: Simplify right side
    645,085.12x = 315,784,978,022.02
  5. Step 5: Solve for x
    x = 315,784,978,022.02/645,085.12
  6. Step 6: Final answer
    x = 489,524.51

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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.