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Finding the Fourth Proportional to 643,426.36, 887,888.30 and 356,940.60

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Solution

The fourth proportional to 643,426.36, 887,888.30 and 356,940.60 is: 492,555.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,426.36 : 887,888.30 = 356,940.60 : x
  2. Step 2: Convert to fraction form
    643,426.36/887,888.30 = 356,940.60/x
  3. Step 3: Cross multiply
    643,426.36x = 887,888.30 × 356,940.60
  4. Step 4: Simplify right side
    643,426.36x = 316,923,382,534.98
  5. Step 5: Solve for x
    x = 316,923,382,534.98/643,426.36
  6. Step 6: Final answer
    x = 492,555.80

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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.