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Finding the Fourth Proportional to 39,118.67, 53,983.79 and 21,213.67

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Solution

The fourth proportional to 39,118.67, 53,983.79 and 21,213.67 is: 29,274.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,118.67 : 53,983.79 = 21,213.67 : x
  2. Step 2: Convert to fraction form
    39,118.67/53,983.79 = 21,213.67/x
  3. Step 3: Cross multiply
    39,118.67x = 53,983.79 × 21,213.67
  4. Step 4: Simplify right side
    39,118.67x = 1,145,193,930.42
  5. Step 5: Solve for x
    x = 1,145,193,930.42/39,118.67
  6. Step 6: Final answer
    x = 29,274.87

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1.5x scale

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.