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Finding the Fourth Proportional to 645,166.74, 890,352.48 and 354,790.20

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Solution

The fourth proportional to 645,166.74, 890,352.48 and 354,790.20 is: 489,622.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,166.74 : 890,352.48 = 354,790.20 : x
  2. Step 2: Convert to fraction form
    645,166.74/890,352.48 = 354,790.20/x
  3. Step 3: Cross multiply
    645,166.74x = 890,352.48 × 354,790.20
  4. Step 4: Simplify right side
    645,166.74x = 315,888,334,449.70
  5. Step 5: Solve for x
    x = 315,888,334,449.70/645,166.74
  6. Step 6: Final answer
    x = 489,622.78

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Double scale
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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.