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Finding the Fourth Proportional to 718,289,776.88, 991,239,453.66 and 388,264,915.88

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Solution

The fourth proportional to 718,289,776.88, 991,239,453.66 and 388,264,915.88 is: 535,805,346.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,289,776.88 : 991,239,453.66 = 388,264,915.88 : x
  2. Step 2: Convert to fraction form
    718,289,776.88/991,239,453.66 = 388,264,915.88/x
  3. Step 3: Cross multiply
    718,289,776.88x = 991,239,453.66 × 388,264,915.88
  4. Step 4: Simplify right side
    718,289,776.88x = 384,863,503,087,280,832
  5. Step 5: Solve for x
    x = 384,863,503,087,280,832/718,289,776.88
  6. Step 6: Final answer
    x = 535,805,346.92

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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.