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Finding the Fourth Proportional to 18,638.76, 27,958.35 and 5,491.38

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Solution

The fourth proportional to 18,638.76, 27,958.35 and 5,491.38 is: 8,237.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,638.76 : 27,958.35 = 5,491.38 : x
  2. Step 2: Convert to fraction form
    18,638.76/27,958.35 = 5,491.38/x
  3. Step 3: Cross multiply
    18,638.76x = 27,958.35 × 5,491.38
  4. Step 4: Simplify right side
    18,638.76x = 153,529,924.02
  5. Step 5: Solve for x
    x = 153,529,924.02/18,638.76
  6. Step 6: Final answer
    x = 8,237.13

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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.