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Finding the Fourth Proportional to 20,539.68, 30,809.52 and 7,391.72

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Solution

The fourth proportional to 20,539.68, 30,809.52 and 7,391.72 is: 11,087.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,539.68 : 30,809.52 = 7,391.72 : x
  2. Step 2: Convert to fraction form
    20,539.68/30,809.52 = 7,391.72/x
  3. Step 3: Cross multiply
    20,539.68x = 30,809.52 × 7,391.72
  4. Step 4: Simplify right side
    20,539.68x = 227,735,191.13
  5. Step 5: Solve for x
    x = 227,735,191.13/20,539.68
  6. Step 6: Final answer
    x = 11,087.57

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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.