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Finding the Fourth Proportional to 6,409.40, 9,615.90 and 3,122.60

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Solution

The fourth proportional to 6,409.40, 9,615.90 and 3,122.60 is: 4,684.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,409.40 : 9,615.90 = 3,122.60 : x
  2. Step 2: Convert to fraction form
    6,409.40/9,615.90 = 3,122.60/x
  3. Step 3: Cross multiply
    6,409.40x = 9,615.90 × 3,122.60
  4. Step 4: Simplify right side
    6,409.40x = 30,026,609.34
  5. Step 5: Solve for x
    x = 30,026,609.34/6,409.40
  6. Step 6: Final answer
    x = 4,684.78

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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.