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Finding the Fourth Proportional to 718,290,657.39, 991,240,668.81 and 388,265,796.39

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Solution

The fourth proportional to 718,290,657.39, 991,240,668.81 and 388,265,796.39 is: 535,806,562.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,290,657.39 : 991,240,668.81 = 388,265,796.39 : x
  2. Step 2: Convert to fraction form
    718,290,657.39/991,240,668.81 = 388,265,796.39/x
  3. Step 3: Cross multiply
    718,290,657.39x = 991,240,668.81 × 388,265,796.39
  4. Step 4: Simplify right side
    718,290,657.39x = 384,864,847,689,670,848
  5. Step 5: Solve for x
    x = 384,864,847,689,670,848/718,290,657.39
  6. Step 6: Final answer
    x = 535,806,562.05

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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.