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Finding the Fourth Proportional to 643,108.18, 887,542.50 and 356,720.80

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Solution

The fourth proportional to 643,108.18, 887,542.50 and 356,720.80 is: 492,304.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,108.18 : 887,542.50 = 356,720.80 : x
  2. Step 2: Convert to fraction form
    643,108.18/887,542.50 = 356,720.80/x
  3. Step 3: Cross multiply
    643,108.18x = 887,542.50 × 356,720.80
  4. Step 4: Simplify right side
    643,108.18x = 316,604,870,634
  5. Step 5: Solve for x
    x = 316,604,870,634/643,108.18
  6. Step 6: Final answer
    x = 492,304.22

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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.