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Finding the Fourth Proportional to 643,033.30, 887,342.70 and 356,542.78

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Solution

The fourth proportional to 643,033.30, 887,342.70 and 356,542.78 is: 492,005.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,033.30 : 887,342.70 = 356,542.78 : x
  2. Step 2: Convert to fraction form
    643,033.30/887,342.70 = 356,542.78/x
  3. Step 3: Cross multiply
    643,033.30x = 887,342.70 × 356,542.78
  4. Step 4: Simplify right side
    643,033.30x = 316,375,633,070.71
  5. Step 5: Solve for x
    x = 316,375,633,070.71/643,033.30
  6. Step 6: Final answer
    x = 492,005.05

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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.