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Finding the Fourth Proportional to 18,648.63, 27,972.90 and 13,126.59

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Solution

The fourth proportional to 18,648.63, 27,972.90 and 13,126.59 is: 19,689.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,648.63 : 27,972.90 = 13,126.59 : x
  2. Step 2: Convert to fraction form
    18,648.63/27,972.90 = 13,126.59/x
  3. Step 3: Cross multiply
    18,648.63x = 27,972.90 × 13,126.59
  4. Step 4: Simplify right side
    18,648.63x = 367,188,789.41
  5. Step 5: Solve for x
    x = 367,188,789.41/18,648.63
  6. Step 6: Final answer
    x = 19,689.85

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1.5x scale

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.