Home / 21,209.80-31,802.57-8,738.43

Finding the Fourth Proportional to 21,209.80, 31,802.57 and 8,738.43

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Solution

The fourth proportional to 21,209.80, 31,802.57 and 8,738.43 is: 13,102.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,209.80 : 31,802.57 = 8,738.43 : x
  2. Step 2: Convert to fraction form
    21,209.80/31,802.57 = 8,738.43/x
  3. Step 3: Cross multiply
    21,209.80x = 31,802.57 × 8,738.43
  4. Step 4: Simplify right side
    21,209.80x = 277,904,574.33
  5. Step 5: Solve for x
    x = 277,904,574.33/21,209.80
  6. Step 6: Final answer
    x = 13,102.65

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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.