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Finding the Fourth Proportional to 620,687.18, 856,940.44 and 406,189.87

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Solution

The fourth proportional to 620,687.18, 856,940.44 and 406,189.87 is: 560,798.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,687.18 : 856,940.44 = 406,189.87 : x
  2. Step 2: Convert to fraction form
    620,687.18/856,940.44 = 406,189.87/x
  3. Step 3: Cross multiply
    620,687.18x = 856,940.44 × 406,189.87
  4. Step 4: Simplify right side
    620,687.18x = 348,080,525,921.34
  5. Step 5: Solve for x
    x = 348,080,525,921.34/620,687.18
  6. Step 6: Final answer
    x = 560,798.64

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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.