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Finding the Fourth Proportional to 643,043.28, 887,398.20 and 356,556

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Solution

The fourth proportional to 643,043.28, 887,398.20 and 356,556 is: 492,046.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,043.28 : 887,398.20 = 356,556 : x
  2. Step 2: Convert to fraction form
    643,043.28/887,398.20 = 356,556/x
  3. Step 3: Cross multiply
    643,043.28x = 887,398.20 × 356,556
  4. Step 4: Simplify right side
    643,043.28x = 316,407,152,599.20
  5. Step 5: Solve for x
    x = 316,407,152,599.20/643,043.28
  6. Step 6: Final answer
    x = 492,046.43

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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.