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Finding the Fourth Proportional to 6,420.80, 9,622.20 and 5,106.80

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Solution

The fourth proportional to 6,420.80, 9,622.20 and 5,106.80 is: 7,653.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.80 : 9,622.20 = 5,106.80 : x
  2. Step 2: Convert to fraction form
    6,420.80/9,622.20 = 5,106.80/x
  3. Step 3: Cross multiply
    6,420.80x = 9,622.20 × 5,106.80
  4. Step 4: Simplify right side
    6,420.80x = 49,138,650.96
  5. Step 5: Solve for x
    x = 49,138,650.96/6,420.80
  6. Step 6: Final answer
    x = 7,653.04

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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.