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Finding the Fourth Proportional to 18,129.70, 27,180.15 and 9,921.70

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Solution

The fourth proportional to 18,129.70, 27,180.15 and 9,921.70 is: 14,874.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.70 : 27,180.15 = 9,921.70 : x
  2. Step 2: Convert to fraction form
    18,129.70/27,180.15 = 9,921.70/x
  3. Step 3: Cross multiply
    18,129.70x = 27,180.15 × 9,921.70
  4. Step 4: Simplify right side
    18,129.70x = 269,673,294.26
  5. Step 5: Solve for x
    x = 269,673,294.26/18,129.70
  6. Step 6: Final answer
    x = 14,874.67

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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.