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Finding the Fourth Proportional to 6,389.68, 8,821.22 and 4,481.36

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Solution

The fourth proportional to 6,389.68, 8,821.22 and 4,481.36 is: 6,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,389.68 : 8,821.22 = 4,481.36 : x
  2. Step 2: Convert to fraction form
    6,389.68/8,821.22 = 4,481.36/x
  3. Step 3: Cross multiply
    6,389.68x = 8,821.22 × 4,481.36
  4. Step 4: Simplify right side
    6,389.68x = 39,531,044.78
  5. Step 5: Solve for x
    x = 39,531,044.78/6,389.68
  6. Step 6: Final answer
    x = 6,186.70

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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.