Home / 21,012.78-31,486.30-17,879.91

Finding the Fourth Proportional to 21,012.78, 31,486.30 and 17,879.91

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Solution

The fourth proportional to 21,012.78, 31,486.30 and 17,879.91 is: 26,791.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.78 : 31,486.30 = 17,879.91 : x
  2. Step 2: Convert to fraction form
    21,012.78/31,486.30 = 17,879.91/x
  3. Step 3: Cross multiply
    21,012.78x = 31,486.30 × 17,879.91
  4. Step 4: Simplify right side
    21,012.78x = 562,972,210.23
  5. Step 5: Solve for x
    x = 562,972,210.23/21,012.78
  6. Step 6: Final answer
    x = 26,791.90

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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.