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Finding the Fourth Proportional to 20,487.88, 30,735.90 and 6,451.44

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Solution

The fourth proportional to 20,487.88, 30,735.90 and 6,451.44 is: 9,678.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.88 : 30,735.90 = 6,451.44 : x
  2. Step 2: Convert to fraction form
    20,487.88/30,735.90 = 6,451.44/x
  3. Step 3: Cross multiply
    20,487.88x = 30,735.90 × 6,451.44
  4. Step 4: Simplify right side
    20,487.88x = 198,290,814.70
  5. Step 5: Solve for x
    x = 198,290,814.70/20,487.88
  6. Step 6: Final answer
    x = 9,678.45

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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.