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Finding the Fourth Proportional to 19,929.12, 27,495 and 13,218

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Solution

The fourth proportional to 19,929.12, 27,495 and 13,218 is: 18,236.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,929.12 : 27,495 = 13,218 : x
  2. Step 2: Convert to fraction form
    19,929.12/27,495 = 13,218/x
  3. Step 3: Cross multiply
    19,929.12x = 27,495 × 13,218
  4. Step 4: Simplify right side
    19,929.12x = 363,428,910
  5. Step 5: Solve for x
    x = 363,428,910/19,929.12
  6. Step 6: Final answer
    x = 18,236.07

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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.