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Finding the Fourth Proportional to 718,697,780.20, 991,805,925.90 and 388,672,919.20

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Solution

The fourth proportional to 718,697,780.20, 991,805,925.90 and 388,672,919.20 is: 536,370,245.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,780.20 : 991,805,925.90 = 388,672,919.20 : x
  2. Step 2: Convert to fraction form
    718,697,780.20/991,805,925.90 = 388,672,919.20/x
  3. Step 3: Cross multiply
    718,697,780.20x = 991,805,925.90 × 388,672,919.20
  4. Step 4: Simplify right side
    718,697,780.20x = 385,488,104,499,411,840
  5. Step 5: Solve for x
    x = 385,488,104,499,411,840/718,697,780.20
  6. Step 6: Final answer
    x = 536,370,245.07

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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.