Home / 645,156.96-890,373.34-354,819.66

Finding the Fourth Proportional to 645,156.96, 890,373.34 and 354,819.66

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Solution

The fourth proportional to 645,156.96, 890,373.34 and 354,819.66 is: 489,682.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,156.96 : 890,373.34 = 354,819.66 : x
  2. Step 2: Convert to fraction form
    645,156.96/890,373.34 = 354,819.66/x
  3. Step 3: Cross multiply
    645,156.96x = 890,373.34 × 354,819.66
  4. Step 4: Simplify right side
    645,156.96x = 315,921,965,771.86
  5. Step 5: Solve for x
    x = 315,921,965,771.86/645,156.96
  6. Step 6: Final answer
    x = 489,682.33

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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.