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Finding the Fourth Proportional to 139,384,915.20, 209,077,372.80 and 84,965,356.80

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Solution

The fourth proportional to 139,384,915.20, 209,077,372.80 and 84,965,356.80 is: 127,448,035.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,384,915.20 : 209,077,372.80 = 84,965,356.80 : x
  2. Step 2: Convert to fraction form
    139,384,915.20/209,077,372.80 = 84,965,356.80/x
  3. Step 3: Cross multiply
    139,384,915.20x = 209,077,372.80 × 84,965,356.80
  4. Step 4: Simplify right side
    139,384,915.20x = 17,764,333,578,758,616
  5. Step 5: Solve for x
    x = 17,764,333,578,758,616/139,384,915.20
  6. Step 6: Final answer
    x = 127,448,035.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.