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Finding the Fourth Proportional to 20,591.20, 30,868.32 and 7,440.48

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Solution

The fourth proportional to 20,591.20, 30,868.32 and 7,440.48 is: 11,154.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,591.20 : 30,868.32 = 7,440.48 : x
  2. Step 2: Convert to fraction form
    20,591.20/30,868.32 = 7,440.48/x
  3. Step 3: Cross multiply
    20,591.20x = 30,868.32 × 7,440.48
  4. Step 4: Simplify right side
    20,591.20x = 229,675,117.59
  5. Step 5: Solve for x
    x = 229,675,117.59/20,591.20
  6. Step 6: Final answer
    x = 11,154.04

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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.