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Finding the Fourth Proportional to 13,219, 18,242.22 and 7,331

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Solution

The fourth proportional to 13,219, 18,242.22 and 7,331 is: 10,116.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219 : 18,242.22 = 7,331 : x
  2. Step 2: Convert to fraction form
    13,219/18,242.22 = 7,331/x
  3. Step 3: Cross multiply
    13,219x = 18,242.22 × 7,331
  4. Step 4: Simplify right side
    13,219x = 133,733,714.82
  5. Step 5: Solve for x
    x = 133,733,714.82/13,219
  6. Step 6: Final answer
    x = 10,116.78

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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.