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Finding the Fourth Proportional to 7,918.40, 11,906.40 and 6,651.20

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Solution

The fourth proportional to 7,918.40, 11,906.40 and 6,651.20 is: 10,000.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,918.40 : 11,906.40 = 6,651.20 : x
  2. Step 2: Convert to fraction form
    7,918.40/11,906.40 = 6,651.20/x
  3. Step 3: Cross multiply
    7,918.40x = 11,906.40 × 6,651.20
  4. Step 4: Simplify right side
    7,918.40x = 79,191,847.68
  5. Step 5: Solve for x
    x = 79,191,847.68/7,918.40
  6. Step 6: Final answer
    x = 10,000.99

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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.