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Finding the Fourth Proportional to 691,394,357.21, 954,066,534.32 and 389,963,057.90

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Solution

The fourth proportional to 691,394,357.21, 954,066,534.32 and 389,963,057.90 is: 538,116,487.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,394,357.21 : 954,066,534.32 = 389,963,057.90 : x
  2. Step 2: Convert to fraction form
    691,394,357.21/954,066,534.32 = 389,963,057.90/x
  3. Step 3: Cross multiply
    691,394,357.21x = 954,066,534.32 × 389,963,057.90
  4. Step 4: Simplify right side
    691,394,357.21x = 372,050,703,161,532,672
  5. Step 5: Solve for x
    x = 372,050,703,161,532,672/691,394,357.21
  6. Step 6: Final answer
    x = 538,116,487.76

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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.