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Finding the Fourth Proportional to 6,412.80, 9,608.40 and 4,220.40

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Solution

The fourth proportional to 6,412.80, 9,608.40 and 4,220.40 is: 6,323.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,412.80 : 9,608.40 = 4,220.40 : x
  2. Step 2: Convert to fraction form
    6,412.80/9,608.40 = 4,220.40/x
  3. Step 3: Cross multiply
    6,412.80x = 9,608.40 × 4,220.40
  4. Step 4: Simplify right side
    6,412.80x = 40,551,291.36
  5. Step 5: Solve for x
    x = 40,551,291.36/6,412.80
  6. Step 6: Final answer
    x = 6,323.49

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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.