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Finding the Fourth Proportional to 10,939.10, 16,420.80 and 8,484.80

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Solution

The fourth proportional to 10,939.10, 16,420.80 and 8,484.80 is: 12,736.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,939.10 : 16,420.80 = 8,484.80 : x
  2. Step 2: Convert to fraction form
    10,939.10/16,420.80 = 8,484.80/x
  3. Step 3: Cross multiply
    10,939.10x = 16,420.80 × 8,484.80
  4. Step 4: Simplify right side
    10,939.10x = 139,327,203.84
  5. Step 5: Solve for x
    x = 139,327,203.84/10,939.10
  6. Step 6: Final answer
    x = 12,736.62

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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.