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Finding the Fourth Proportional to 643,115.80, 887,502.18 and 356,662.36

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Solution

The fourth proportional to 643,115.80, 887,502.18 and 356,662.36 is: 492,195.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,115.80 : 887,502.18 = 356,662.36 : x
  2. Step 2: Convert to fraction form
    643,115.80/887,502.18 = 356,662.36/x
  3. Step 3: Cross multiply
    643,115.80x = 887,502.18 × 356,662.36
  4. Step 4: Simplify right side
    643,115.80x = 316,538,622,023.95
  5. Step 5: Solve for x
    x = 316,538,622,023.95/643,115.80
  6. Step 6: Final answer
    x = 492,195.37

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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.