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Finding the Fourth Proportional to 644,985.79, 890,091.05 and 354,609.63

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Solution

The fourth proportional to 644,985.79, 890,091.05 and 354,609.63 is: 489,367.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,985.79 : 890,091.05 = 354,609.63 : x
  2. Step 2: Convert to fraction form
    644,985.79/890,091.05 = 354,609.63/x
  3. Step 3: Cross multiply
    644,985.79x = 890,091.05 × 354,609.63
  4. Step 4: Simplify right side
    644,985.79x = 315,634,856,133.76
  5. Step 5: Solve for x
    x = 315,634,856,133.76/644,985.79
  6. Step 6: Final answer
    x = 489,367.15

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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.