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Finding the Fourth Proportional to 643,187.20, 887,651.54 and 356,799.80

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Solution

The fourth proportional to 643,187.20, 887,651.54 and 356,799.80 is: 492,413.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,187.20 : 887,651.54 = 356,799.80 : x
  2. Step 2: Convert to fraction form
    643,187.20/887,651.54 = 356,799.80/x
  3. Step 3: Cross multiply
    643,187.20x = 887,651.54 × 356,799.80
  4. Step 4: Simplify right side
    643,187.20x = 316,713,891,941.69
  5. Step 5: Solve for x
    x = 316,713,891,941.69/643,187.20
  6. Step 6: Final answer
    x = 492,413.24

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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.