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Finding the Fourth Proportional to 642,534.36, 886,687.02 and 356,053.56

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Solution

The fourth proportional to 642,534.36, 886,687.02 and 356,053.56 is: 491,348.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,534.36 : 886,687.02 = 356,053.56 : x
  2. Step 2: Convert to fraction form
    642,534.36/886,687.02 = 356,053.56/x
  3. Step 3: Cross multiply
    642,534.36x = 886,687.02 × 356,053.56
  4. Step 4: Simplify right side
    642,534.36x = 315,708,070,076.79
  5. Step 5: Solve for x
    x = 315,708,070,076.79/642,534.36
  6. Step 6: Final answer
    x = 491,348.15

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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.