Home / 21,213.47-31,820.15-5,418.48

Finding the Fourth Proportional to 21,213.47, 31,820.15 and 5,418.48

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Solution

The fourth proportional to 21,213.47, 31,820.15 and 5,418.48 is: 8,127.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213.47 : 31,820.15 = 5,418.48 : x
  2. Step 2: Convert to fraction form
    21,213.47/31,820.15 = 5,418.48/x
  3. Step 3: Cross multiply
    21,213.47x = 31,820.15 × 5,418.48
  4. Step 4: Simplify right side
    21,213.47x = 172,416,819.28
  5. Step 5: Solve for x
    x = 172,416,819.28/21,213.47
  6. Step 6: Final answer
    x = 8,127.71

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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.