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Finding the Fourth Proportional to 6,469.13, 8,921.98 and 3,980.81

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Solution

The fourth proportional to 6,469.13, 8,921.98 and 3,980.81 is: 5,490.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,469.13 : 8,921.98 = 3,980.81 : x
  2. Step 2: Convert to fraction form
    6,469.13/8,921.98 = 3,980.81/x
  3. Step 3: Cross multiply
    6,469.13x = 8,921.98 × 3,980.81
  4. Step 4: Simplify right side
    6,469.13x = 35,516,707.20
  5. Step 5: Solve for x
    x = 35,516,707.20/6,469.13
  6. Step 6: Final answer
    x = 5,490.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.