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Finding the Fourth Proportional to 18,579.31, 25,639.37 and 11,031.84

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Solution

The fourth proportional to 18,579.31, 25,639.37 and 11,031.84 is: 15,223.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,579.31 : 25,639.37 = 11,031.84 : x
  2. Step 2: Convert to fraction form
    18,579.31/25,639.37 = 11,031.84/x
  3. Step 3: Cross multiply
    18,579.31x = 25,639.37 × 11,031.84
  4. Step 4: Simplify right side
    18,579.31x = 282,849,372.38
  5. Step 5: Solve for x
    x = 282,849,372.38/18,579.31
  6. Step 6: Final answer
    x = 15,223.89

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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.