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Finding the Fourth Proportional to 39,861.99, 55,008.89 and 21,958.67

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Solution

The fourth proportional to 39,861.99, 55,008.89 and 21,958.67 is: 30,302.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,861.99 : 55,008.89 = 21,958.67 : x
  2. Step 2: Convert to fraction form
    39,861.99/55,008.89 = 21,958.67/x
  3. Step 3: Cross multiply
    39,861.99x = 55,008.89 × 21,958.67
  4. Step 4: Simplify right side
    39,861.99x = 1,207,922,062.58
  5. Step 5: Solve for x
    x = 1,207,922,062.58/39,861.99
  6. Step 6: Final answer
    x = 30,302.60

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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.