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Finding the Fourth Proportional to 20,635.79, 30,955.74 and 7,489.19

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Solution

The fourth proportional to 20,635.79, 30,955.74 and 7,489.19 is: 11,234.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,635.79 : 30,955.74 = 7,489.19 : x
  2. Step 2: Convert to fraction form
    20,635.79/30,955.74 = 7,489.19/x
  3. Step 3: Cross multiply
    20,635.79x = 30,955.74 × 7,489.19
  4. Step 4: Simplify right side
    20,635.79x = 231,833,418.45
  5. Step 5: Solve for x
    x = 231,833,418.45/20,635.79
  6. Step 6: Final answer
    x = 11,234.53

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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.