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Finding the Fourth Proportional to 543,685.78, 815,645.40 and 211,261.78

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Solution

The fourth proportional to 543,685.78, 815,645.40 and 211,261.78 is: 316,938.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,685.78 : 815,645.40 = 211,261.78 : x
  2. Step 2: Convert to fraction form
    543,685.78/815,645.40 = 211,261.78/x
  3. Step 3: Cross multiply
    543,685.78x = 815,645.40 × 211,261.78
  4. Step 4: Simplify right side
    543,685.78x = 172,314,699,052.81
  5. Step 5: Solve for x
    x = 172,314,699,052.81/543,685.78
  6. Step 6: Final answer
    x = 316,938.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.