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Finding the Fourth Proportional to 642,530.91, 886,697.87 and 356,055.78

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Solution

The fourth proportional to 642,530.91, 886,697.87 and 356,055.78 is: 491,359.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,530.91 : 886,697.87 = 356,055.78 : x
  2. Step 2: Convert to fraction form
    642,530.91/886,697.87 = 356,055.78/x
  3. Step 3: Cross multiply
    642,530.91x = 886,697.87 × 356,055.78
  4. Step 4: Simplify right side
    642,530.91x = 315,713,899,946.91
  5. Step 5: Solve for x
    x = 315,713,899,946.91/642,530.91
  6. Step 6: Final answer
    x = 491,359.86

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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.