Home / 81,721.31-112,786.44-45,920.12

Finding the Fourth Proportional to 81,721.31, 112,786.44 and 45,920.12

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Solution

The fourth proportional to 81,721.31, 112,786.44 and 45,920.12 is: 63,375.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,721.31 : 112,786.44 = 45,920.12 : x
  2. Step 2: Convert to fraction form
    81,721.31/112,786.44 = 45,920.12/x
  3. Step 3: Cross multiply
    81,721.31x = 112,786.44 × 45,920.12
  4. Step 4: Simplify right side
    81,721.31x = 5,179,166,859.17
  5. Step 5: Solve for x
    x = 5,179,166,859.17/81,721.31
  6. Step 6: Final answer
    x = 63,375.96

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1.5x scale

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.