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Finding the Fourth Proportional to 6,457.76, 8,911.41 and 3,939.47

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Solution

The fourth proportional to 6,457.76, 8,911.41 and 3,939.47 is: 5,436.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,457.76 : 8,911.41 = 3,939.47 : x
  2. Step 2: Convert to fraction form
    6,457.76/8,911.41 = 3,939.47/x
  3. Step 3: Cross multiply
    6,457.76x = 8,911.41 × 3,939.47
  4. Step 4: Simplify right side
    6,457.76x = 35,106,187.80
  5. Step 5: Solve for x
    x = 35,106,187.80/6,457.76
  6. Step 6: Final answer
    x = 5,436.28

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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.