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Finding the Fourth Proportional to 20,797.70, 31,208.70 and 7,651.40

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Solution

The fourth proportional to 20,797.70, 31,208.70 and 7,651.40 is: 11,481.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,797.70 : 31,208.70 = 7,651.40 : x
  2. Step 2: Convert to fraction form
    20,797.70/31,208.70 = 7,651.40/x
  3. Step 3: Cross multiply
    20,797.70x = 31,208.70 × 7,651.40
  4. Step 4: Simplify right side
    20,797.70x = 238,790,247.18
  5. Step 5: Solve for x
    x = 238,790,247.18/20,797.70
  6. Step 6: Final answer
    x = 11,481.57

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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.