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Finding the Fourth Proportional to 386,992,920.30, 543,320,638.50 and 386,992,920.30

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Solution

The fourth proportional to 386,992,920.30, 543,320,638.50 and 386,992,920.30 is: 543,320,638.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,992,920.30 : 543,320,638.50 = 386,992,920.30 : x
  2. Step 2: Convert to fraction form
    386,992,920.30/543,320,638.50 = 386,992,920.30/x
  3. Step 3: Cross multiply
    386,992,920.30x = 543,320,638.50 × 386,992,920.30
  4. Step 4: Simplify right side
    386,992,920.30x = 210,261,240,552,375,616
  5. Step 5: Solve for x
    x = 210,261,240,552,375,616/386,992,920.30
  6. Step 6: Final answer
    x = 543,320,638.50

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.