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Finding the Fourth Proportional to 13,384.50, 18,471.10 and 8,078.28

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Solution

The fourth proportional to 13,384.50, 18,471.10 and 8,078.28 is: 11,148.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,384.50 : 18,471.10 = 8,078.28 : x
  2. Step 2: Convert to fraction form
    13,384.50/18,471.10 = 8,078.28/x
  3. Step 3: Cross multiply
    13,384.50x = 18,471.10 × 8,078.28
  4. Step 4: Simplify right side
    13,384.50x = 149,214,717.71
  5. Step 5: Solve for x
    x = 149,214,717.71/13,384.50
  6. Step 6: Final answer
    x = 11,148.32

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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.