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Finding the Fourth Proportional to 7,606.40, 11,409.60 and 6,812.80

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Solution

The fourth proportional to 7,606.40, 11,409.60 and 6,812.80 is: 10,219.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,606.40 : 11,409.60 = 6,812.80 : x
  2. Step 2: Convert to fraction form
    7,606.40/11,409.60 = 6,812.80/x
  3. Step 3: Cross multiply
    7,606.40x = 11,409.60 × 6,812.80
  4. Step 4: Simplify right side
    7,606.40x = 77,731,322.88
  5. Step 5: Solve for x
    x = 77,731,322.88/7,606.40
  6. Step 6: Final answer
    x = 10,219.20

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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.