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Finding the Fourth Proportional to 721,743,228.78, 996,006,616.83 and 391,718,367.78

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Solution

The fourth proportional to 721,743,228.78, 996,006,616.83 and 391,718,367.78 is: 540,571,869.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,743,228.78 : 996,006,616.83 = 391,718,367.78 : x
  2. Step 2: Convert to fraction form
    721,743,228.78/996,006,616.83 = 391,718,367.78/x
  3. Step 3: Cross multiply
    721,743,228.78x = 996,006,616.83 × 391,718,367.78
  4. Step 4: Simplify right side
    721,743,228.78x = 390,154,086,242,727,488
  5. Step 5: Solve for x
    x = 390,154,086,242,727,488/721,743,228.78
  6. Step 6: Final answer
    x = 540,571,869.17

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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.