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Finding the Fourth Proportional to 718,697,290.16, 991,805,249.12 and 388,672,429.12

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Solution

The fourth proportional to 718,697,290.16, 991,805,249.12 and 388,672,429.12 is: 536,369,568.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,290.16 : 991,805,249.12 = 388,672,429.12 : x
  2. Step 2: Convert to fraction form
    718,697,290.16/991,805,249.12 = 388,672,429.12/x
  3. Step 3: Cross multiply
    718,697,290.16x = 991,805,249.12 × 388,672,429.12
  4. Step 4: Simplify right side
    718,697,290.16x = 385,487,355,389,437,120
  5. Step 5: Solve for x
    x = 385,487,355,389,437,120/718,697,290.16
  6. Step 6: Final answer
    x = 536,369,568.48

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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.