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Finding the Fourth Proportional to 691,394,356.71, 954,066,533.63 and 389,963,057.40

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Solution

The fourth proportional to 691,394,356.71, 954,066,533.63 and 389,963,057.40 is: 538,116,487.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,394,356.71 : 954,066,533.63 = 389,963,057.40 : x
  2. Step 2: Convert to fraction form
    691,394,356.71/954,066,533.63 = 389,963,057.40/x
  3. Step 3: Cross multiply
    691,394,356.71x = 954,066,533.63 × 389,963,057.40
  4. Step 4: Simplify right side
    691,394,356.71x = 372,050,702,415,424,896
  5. Step 5: Solve for x
    x = 372,050,702,415,424,896/691,394,356.71
  6. Step 6: Final answer
    x = 538,116,487.07

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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.