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Finding the Fourth Proportional to 12,172, 18,258 and 2,938

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Solution

The fourth proportional to 12,172, 18,258 and 2,938 is: 4,407

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,172 : 18,258 = 2,938 : x
  2. Step 2: Convert to fraction form
    12,172/18,258 = 2,938/x
  3. Step 3: Cross multiply
    12,172x = 18,258 × 2,938
  4. Step 4: Simplify right side
    12,172x = 53,642,004
  5. Step 5: Solve for x
    x = 53,642,004/12,172
  6. Step 6: Final answer
    x = 4,407

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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.