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Finding the Fourth Proportional to 718,697,279.55, 991,805,234.49 and 388,672,418.55

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Solution

The fourth proportional to 718,697,279.55, 991,805,234.49 and 388,672,418.55 is: 536,369,553.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,279.55 : 991,805,234.49 = 388,672,418.55 : x
  2. Step 2: Convert to fraction form
    718,697,279.55/991,805,234.49 = 388,672,418.55/x
  3. Step 3: Cross multiply
    718,697,279.55x = 991,805,234.49 × 388,672,418.55
  4. Step 4: Simplify right side
    718,697,279.55x = 385,487,339,219,778,176
  5. Step 5: Solve for x
    x = 385,487,339,219,778,176/718,697,279.55
  6. Step 6: Final answer
    x = 536,369,553.90

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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.