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Finding the Fourth Proportional to 6,440.80, 9,661.20 and 3,362.40

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Solution

The fourth proportional to 6,440.80, 9,661.20 and 3,362.40 is: 5,043.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,440.80 : 9,661.20 = 3,362.40 : x
  2. Step 2: Convert to fraction form
    6,440.80/9,661.20 = 3,362.40/x
  3. Step 3: Cross multiply
    6,440.80x = 9,661.20 × 3,362.40
  4. Step 4: Simplify right side
    6,440.80x = 32,484,818.88
  5. Step 5: Solve for x
    x = 32,484,818.88/6,440.80
  6. Step 6: Final answer
    x = 5,043.60

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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.