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Finding the Fourth Proportional to 6,687.90, 10,019.70 and 4,087.80

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Solution

The fourth proportional to 6,687.90, 10,019.70 and 4,087.80 is: 6,124.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,687.90 : 10,019.70 = 4,087.80 : x
  2. Step 2: Convert to fraction form
    6,687.90/10,019.70 = 4,087.80/x
  3. Step 3: Cross multiply
    6,687.90x = 10,019.70 × 4,087.80
  4. Step 4: Simplify right side
    6,687.90x = 40,958,529.66
  5. Step 5: Solve for x
    x = 40,958,529.66/6,687.90
  6. Step 6: Final answer
    x = 6,124.27

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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.