Home / 100,640.21-138,880.49-57,618.27

Finding the Fourth Proportional to 100,640.21, 138,880.49 and 57,618.27

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Solution

The fourth proportional to 100,640.21, 138,880.49 and 57,618.27 is: 79,511.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,640.21 : 138,880.49 = 57,618.27 : x
  2. Step 2: Convert to fraction form
    100,640.21/138,880.49 = 57,618.27/x
  3. Step 3: Cross multiply
    100,640.21x = 138,880.49 × 57,618.27
  4. Step 4: Simplify right side
    100,640.21x = 8,002,053,282.46
  5. Step 5: Solve for x
    x = 8,002,053,282.46/100,640.21
  6. Step 6: Final answer
    x = 79,511.50

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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.