Home / 21,287.63-31,920.33-7,949.65

Finding the Fourth Proportional to 21,287.63, 31,920.33 and 7,949.65

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Solution

The fourth proportional to 21,287.63, 31,920.33 and 7,949.65 is: 11,920.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287.63 : 31,920.33 = 7,949.65 : x
  2. Step 2: Convert to fraction form
    21,287.63/31,920.33 = 7,949.65/x
  3. Step 3: Cross multiply
    21,287.63x = 31,920.33 × 7,949.65
  4. Step 4: Simplify right side
    21,287.63x = 253,755,401.39
  5. Step 5: Solve for x
    x = 253,755,401.39/21,287.63
  6. Step 6: Final answer
    x = 11,920.32

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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.