Home / 78,581.30-117,868.82-19,415.43

Finding the Fourth Proportional to 78,581.30, 117,868.82 and 19,415.43

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Solution

The fourth proportional to 78,581.30, 117,868.82 and 19,415.43 is: 29,122.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,581.30 : 117,868.82 = 19,415.43 : x
  2. Step 2: Convert to fraction form
    78,581.30/117,868.82 = 19,415.43/x
  3. Step 3: Cross multiply
    78,581.30x = 117,868.82 × 19,415.43
  4. Step 4: Simplify right side
    78,581.30x = 2,288,473,726.82
  5. Step 5: Solve for x
    x = 2,288,473,726.82/78,581.30
  6. Step 6: Final answer
    x = 29,122.37

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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.