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Finding the Fourth Proportional to 643,456.98, 887,994.36 and 388,758.96

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Solution

The fourth proportional to 643,456.98, 887,994.36 and 388,758.96 is: 536,501.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,456.98 : 887,994.36 = 388,758.96 : x
  2. Step 2: Convert to fraction form
    643,456.98/887,994.36 = 388,758.96/x
  3. Step 3: Cross multiply
    643,456.98x = 887,994.36 × 388,758.96
  4. Step 4: Simplify right side
    643,456.98x = 345,215,763,879.47
  5. Step 5: Solve for x
    x = 345,215,763,879.47/643,456.98
  6. Step 6: Final answer
    x = 536,501.70

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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.