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Finding the Fourth Proportional to 641,341.76, 885,039.95 and 354,861.84

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Solution

The fourth proportional to 641,341.76, 885,039.95 and 354,861.84 is: 489,702.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,341.76 : 885,039.95 = 354,861.84 : x
  2. Step 2: Convert to fraction form
    641,341.76/885,039.95 = 354,861.84/x
  3. Step 3: Cross multiply
    641,341.76x = 885,039.95 × 354,861.84
  4. Step 4: Simplify right side
    641,341.76x = 314,066,905,130.51
  5. Step 5: Solve for x
    x = 314,066,905,130.51/641,341.76
  6. Step 6: Final answer
    x = 489,702.88

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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.